Io, Callisto, Phobos, Small Endeavour, Explorer, X-Calibur Mini-BBX, Amraam 2, Amraam 3, Amraam 4, Black Brant VB, Black Brant X, D-Region Tomahawk, 1/4-Scale Patriot, 1/2-Scale Patriot, BullPuppy, BullPuppy 2.1, AGM256 Pit Bull Hydra, Intruder, Matrix, Quasar, Ariel, Miranda, Little Lunar Express, Endeavour, Tethys, Pterodactyl Jr., Tiny Pterodactyl, MR-1 AMRAAM-4 w/CPR, Sudden Rush, Eclipse, Thunder N Lightning, Nimbus, Mini-BBX, Quantum Leap 3000 Cirrus, Quantum Leap II Ion, Gamma, Delta, Cygnus, Orion, Eagle, Andromeda, Nimbus, Tempest, Aurora Bulldog, Ultimate Endeavour Pterodactyl, 1/2-Scale Patriot Motor Recommendations - Kit Specifications Quantum, Phenolic and Fiberglassed Phenolic Airframes, Couplers Phenolic and Quantum Payload Section Kits Urethane, Plastic, Fiberglass, Intellicones, Boattails Parachutes, Piston Systems, Shock Cords Replacement Kit and Std. Custom Fins Kwik-Switch, Giant KS, Motor Adapters CRs, CCRs, Bulkplates Dual-Altitude Recovery Systems/Components Staging Systems Altimeters, Timers, Ejection Systems Composites Motor Igniters 5,12,30 Minute, Finishing Epoxies, Expanding Foam Motor Retainers, Launch Lugs, Etc. PML Shirts, Hats Decals Gift Certificates make great gifts!

Motor Retainers, Linear & Standard Launch Lugs, Kwik Links, U-Bolts, Etc.



HAMR Motor Retainers

PML has developed our own line of high quality, threaded motor retainers! The HAMR (Highly Adaptive Motor Retainers) system has been designed specifically for use with our rocket kits or any scratch-built rocket using PML motor tubes. These lightweight, tool-free, threaded retainers are precision CNC turned from 6061 aluminum and anodized. The photo on the right shows the basic retainers for 29mm, 38mm, and 54mm motors. These retainers fit virtually all popular motor brands and types including Aerotech RMS (TM), CTI Pro XX (TM), Animal Motor Works (TM), Hypertech (TM), Kosdon (TM), Sky Ripper (TM), Loki (TM), and others.

The HAMR system can be adapted to existing rockets if the motor tube extends at least 3/8” beyond the aft centering ring. The HAMR can also be used with boattail and tailcone rockets.

Click here for the complete instruction sheet including retro-fit notes and ideas. (720k)

HAMR-KS for Kwik-Switch Motor Retainers

We weren’t about to leave our Kwik-Switch users high and dry so we also developed a system just for you! The HAMR-KS (Highly Adaptable Motor Retainers, Kwik-Switch version) system has been designed specifically for use with our rocket kits or any scratch-built rocket using PML Kwik-Switch motor tubes.

The basic HAMR-54 retainer is mounted to the Mother Tube for use with 54mm motors. Two adapter plates are supplied for flying with 38mm or 29mm motors. Changing from one motor size to another takes just seconds with no tools required!

See our Motor Mounts Page for more information about our Kwik-Switch motor mount system.

These lightweight, tool-free, threaded retainers and adapters are precision CNC turned from 6061 aluminum and anodized. The photo on the right shows the basic 54mm retainer and adapter plates for 38mm and 29mm motors. These retainers fit virtually all popular motor brands and types including Aerotech RMS (TM), CTI Pro XX (TM), Animal Motor Works (TM), Hypertech (TM), Kosdon (TM), Sky Ripper (TM), Loki (TM), and others.

The HAMR system can be adapted to existing rockets if the motor tube extends at least 3/8” beyond the aft centering ring.
The HAMR can also be used with boattail and tailcone rockets.

Following are the outer diameters of the HAMR threaded retainer rings. Regular and KS retainer rings are identical in size.
- 29mm 1.52" OD
- 38mm 1.93" OD
- 54mm 2.59" OD

Click here for photographic examples of using the HAMR-KS adapters with the Kwik-Switch.

Click here for the complete instruction sheet including retro-fit notes and ideas. (720k)

NEW! HAMR Adapters 54/38, 54/29, 38/29

Adapters for HAMR Retainers! If you`re using a HAMR retainer on your rocket and want to fly a smaller diameter motor, here`s your solution! The HAMR Adapters are specifically designed to work with our HAMR system, and are available in 54/38, 54/29 and 38/29 versions.

Click here for the instructional photos showing how the HAMR motor mount adapters are used.

Original PMR (Positive Motor Retention) Motor Retainers

The PML Positive Motor Retention (PMR) motor retention system is durable, reliable, reusable, and simple to install, even on an already-built rocket! . The supplied brass threaded inserts screw into holes you drill in your rockets centering ring, and stay with the rocket. Then, the laser cut, stainless steel Tripod motor retainer slips over the motors nozzle section. Install the 3 socket head bolts with the provided wrench into the threaded brass inserts, and that motors in until YOU decide its coming out! No more worries about friction fitting with masking tape, and no more expensive "kicked" reload casings. Available for 29&38 mm motors; 54mm versions as well as extra brass inserts available below to equip all your rockets with the PMR System. Try the PML Positive Motor Retention System today…you`ll love it!

PMR retainers cannot be used with boattailed or minimum diameter rockets. Also, since the threaded inserts require a 1/4" hole drilled in the aft centering ring, no retainer is available for a 2.5" dia. rocket using a 54mm motor mount. PMR-29/38 should not be used on CR-2.1-1.5 and CR-2.5-2.1 as there is not enough wood for ample insert anchoring. PMR-29/38KS and PMR-54 should not be used in a Quasar kit or with any CR-2.5-2.1 application. Refer to the FAQ below for information on retention in these applications.

PMR retainers also should NOT be used with Loki motors. The retainer will very slightly block the exit of the motor causing overheating of the retainer and/or motor casing and potential failure of the retainer, motor casing, or both. For retainers to use with Loki motors goto http://www.lokiresearch.com/retainer.asp .

You`ll also find our reusable rivets, kwik-links, launch lugs, and other miscellaneous hardware on this page.

Click here for the PML Hardware FAQ.

Part#DescriptionCostQty.

HAMR-KS-SET
HAMR-KS-SET
Designed to incorporate into the popular PML "Kwik-Switch" motor mount system. Complete set with all you need for the 54mm main/mother tube, 38mm KS adapter and 29mm KS adapter. 2.0 ounces total.
$44.95 TEMPORARILY OUT OF STOCK
HAMR-KS38-ADPTR
HAMR-KS38-ADPTR
Adapter disk only for HAMR-KS system. For use with 38mm motors installed in Kwik-Switch 38mm adapter. 0.30 ounces.
$10.95
HAMR-KS29-ADPTR
HAMR-KS29-ADPTR
Adapter disk only for HAMR-KS system. For use with 29mm motors installed in Kwik-Switch 29mm adapter. 0.40 ounces.
$10.95
HAMR-54-SET
HAMR-54-SET
Designed for rockets with a standalone 54mm MMT (see the HAMR-KS for KwikSwitch 54mm). Includes threaded sleeve and retainer cap for 54mm MMT. 1.30 ounces total.
$34.95 TEMPORARILY OUT OF STOCK
HAMR-38-SET
HAMR-38-SET
Designed for rockets with a standalone 38mm MMT (see the HAMR-KS for KwikSwitch 38mm). Includes threaded sleeve and retainer cap for 38mm MMT. 0.80 ounces total.
$31.95 TEMPORARILY OUT OF STOCK
HAMR-29-SET
HAMR-29-SET
Designed for rockets with a standalone 29mm MMT (see the HAMR-KS for KwikSwitch 29mm). Includes threaded sleeve and retainer cap for 29mm MMT. 0.65 ounces total.
$27.95 TEMPORARILY OUT OF STOCK
HAMR-54-SLV
HAMR-54-SLV
Threaded sleeve only for 54mm MMT. 0.65 ounces.
$18.95 TEMPORARILY OUT OF STOCK
HAMR-38-SLV
HAMR-38-SLV
Threaded sleeve only for 38mm MMT. 0.35 ounces.
$16.95 TEMPORARILY OUT OF STOCK
HAMR-29-SLV
HAMR-29-SLV
Threaded sleeve only for 29mm MMT. 0.30 ounces.
$14.95 TEMPORARILY OUT OF STOCK
HAMR-54-CAP
HAMR-54-CAP
Threaded cap only for 54mm MMT. 0.65 ounces.
$17.95
HAMR-38-CAP
HAMR-38-CAP
Threaded cap only for 38mm MMT. 0.45 ounces.
$15.95
HAMR-29-CAP
HAMR-29-CAP
Threaded cap only for 29mm MMT. 0.35 ounces.

$13.95
ADPTR-54/38-HAMR
Adapter for 54/38mm motors in HAMR-retainer-equipped rockets:
54mm to 38mm
Motor mount adapter to fly 38mm motors in kits with a 54mm MMT and 54mm HAMR motor retainer installed. Urethane part: 1.10 oz; 54/38 offset ring: 0.30 oz; 54/38 stepped ring: 0.30 oz.
$21.95
ADPTR-54/29-HAMR
Adapter for 54/29mm motors in HAMR-retainer-equipped rockets:
54mm to 29mm
Motor mount adapter to fly 29mm motors in kits with a 54mm MMT and 54mm HAMR motor retainer installed. Urethane part: 1.10 oz; 54/29 offset ring: 0.35 oz; 54/29 stepped ring: 0.40 oz.
$21.95
ADPTR-38/29-HAMR
Adapter for 38/29mm motors in HAMR-retainer-equipped rockets:
38mm to 29mm
Motor mount adapter to fly 29mm motors in kits with a 38mm MMT and 38mm HAMR motor retainer installed. Urethane part: 0.35 oz; 38/29 offset washer: 0.10 oz.; 38/29 stepped ring: 0.10 oz.
$19.95
PMR-29/38
PMR-29/38
This PMR is intended for use with NON-KwikSwitch rockets that use either a 29mm or 38mm motor mount. Comes with 4-40 screws and brass inserts.
$18.95
PMR-29/38-KS
PMR-29/38-KS
Designed to incorporate into the popular PML "Kwik-Switch" motor mount system. Works only with the 29mm and 38mm adapters. Comes with 8-32 screws and brass inserts. For retaining 54mm motors with the "Kwik-Switch", use the PMR-54 described below.
$18.95
PMR-54
PMR-54
Retains 54mm motors in the "Kwik-Switch" or any other 54mm motor mount installed in rockets 3" dia. and larger. Comes with 8-32 screws and brass inserts.
$19.95
PMR-INSR-4-40
PMR 4-40 Inserts
Contains three (3) 4-40 threaded brass inserts used with the PMR-29/38 so that you can use the same retainer with multiple rockets. Also includes (3) 1.5" long screws and Allen wrench.
$4.99
PMR-INSR-8-32
PMR 8-32 Inserts
Contains three (3) 8-32 threaded brass inserts used with the PMR-29/38-KS and PMR-54 so that you can use the same retainer with multiple rockets. Also includes (3) 1.5" long screws and Allen wrench.
$4.99
HDWE-RVT-NAT
Reusable Plastic Rivets:
Ideal for mounting removable couplers in airframes, securing hatches and securing nose cones to payload sections. 24 rivets to a package.
  • Holds securely to kraft phenolic, fiberglass, plastic tubing and nose cones
  • Once holes are drilled, no tools are required to install the rivets. To remove the rivets, pull cap up with your fingernail or small knife
  • Eliminates wood backing strips that screws require
  • Will not strip hole
  • Low profile (less than 1/16")
  • Rivets are intended for combined material thickness from 0.100" to 0.130"
  • DRL-5/32 drill bit sold separately
$4.95
HDWE-RVT-BLK
Reusable Plastic Rivets - Black:
Same as above, but black in color
$4.95
DRL-5/32
5/32" Drill bit for use with plastic rivets listed above
$2.95
LL-0.25
Launch Lug, thin-wall brass tubing precut to 3"1/4" by 3" 0.175 oz.
$1.25
LL-0.38
Launch Lug, thin-wall brass tubing precut to 3"3/8" by 3"  0.275 oz.
$1.45
LL-0.50
Launch Lug, thin-wall brass tubing precut to 3"1/2" by 3"  0.325 oz.
$1.60
LL-0.75
Launch Lug, thin-wall brass tubing3/4" by 12"  4.7 oz.
$3.30
LRL-10-2
Linear Launch Rail Lugs (2 lugs/pkg) - The new PML Linear Rail Lugs are made of durable yet light-weight urethane. They glide smoothly and securely along both the Blacksky ProRail (TM) and the standard 1" (#1010) 80/20 (TM) brand rail. They have the same frontal area as rail buttons but with much greater surface area so that they can be mounted using epoxy alone in those situations where a screw would interfere with internal components. The lugs can also be mounted using two flathead screws for added strength. The channeled base allows for a conformal fit to any airframe 1.5” dia. and larger. (We recommend a #6 flathead screw, 1/2" long, for attaching the rail lugs.)
$5.95
LRL-10-12
Linear Launch Rail Lugs - 6 packs of above lugs @ 2 lugs/pack; 12 total. Equip your fleet at a reduced price!
$25.95
LRL-15-2
Large Linear Launch Rail Lugs (2 lugs/pkg) The new PML Large Linear Rail Lugs are made of durable yet light-weight urethane. They glide smoothly and securely along the standard 1.5" (#1515 and #1530) 80/20 (TM) brand rail. They have the same frontal area as rail buttons but with much greater surface area so that they can be mounted using epoxy alone in those situations where a screw would interfere with internal components. The lugs can also be mounted using two flathead screws for added strength. The channeled base allows for a conformal fit to any airframe 3.0” dia. and larger. (We recommend a #8 flathead screw, 3/4" long, for attaching the rail lugs.)
$12.95
LRL-15-6
Large Linear Launch Rail Lugs 3 packs of above lugs @ 2 lugs/pack; 6 total. Equip your fleet at a reduced price!
$29.95
HDWE-KL-1.0
Kwik Linksmall  0.2 oz.
$1.15
HDWE-KL-2.0
Kwik Linklarge  0.8 oz.
$1.45
HDWE-EYE-3/16
Eye Bolt3/16-24  0.2 oz.
$0.65
HDWE-NUT-3/16
Nut3/16-24  0.1 oz.
$0.15
HDWE-WASH-3/16
Washerfor eyebolt  0.2 oz.
$0.15
HDWE-UBLT
U-Bolt5/16" dia. x 2" wide (center to center) x 2.750" long 
$3.99
HDWE-DRING-1.0
D-Ring, welded steel1 inch  0.2 oz.
$0.75
HDWE-SHC-2/56
Screw, Socket Head Cap, for altimeter mounting2/56 x 1/4  
$0.45
HDWE-KEY-5/64
Key, Short Arm Hex, 5/64" for altimeter mounting screws HDWE-SHC-2/56   
$0.45
CATALOG
PML Catalog.
$3.00

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