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All you need to assemble the most space efficient minimum diameter retainer...just add the eyebolt and lock nut that matches your threaded motor closure of choice.  This retainer also has the advantage of being readily removable when installed using the included drill guide and set screws, so you can switch out the eyebolt to allow for easy compatibility with varying hardware.  Retainer disk come with a 1/4" hole (Loki compatible), and has a shallow 5/16 recess to ensure center drilling for Aerotech compatibility.


Kit includes:

(1) Retainer disk

(1) Drill guide (for thin wall FG/CF)

(2) Fender washers (5/16" hole)

(4) 4-40 set screws



38 Bare Minimum Diameter Retainer

  • Printed from a professional grade PETG plastic with a high Tg (Glass transition) of 76 deg C (169 deg F), so it will hold up to the most extreme flying site conditions.  All parts are solid (100% infill), so no internal voids or honeycombs. 

  • Every item sold carries a 1 year replacement guarantee against defect or severe damage arising from normal use.  If your Lab Rat Rocketry, LLC product suffers damage during normal use (including nominal flight and recovery) then contact us via email for a replacement.  Please provide as many details as possible in your message, including pictures of the damage.

    Additionally, there is value in damage reports from non-nominal recoveries that result in damage.  If this occurs please contact us via email with as much detail as you can provide, including pictures of the damage, and we may provide a discounted replacement.  These special instances will be decided on a case-by-case basis, and this should not be taken as a guarantee of replacement for damage arising from abnormal use, including non-nominal recovery or damage as a result of cato.


    This guarantee applies only to the parts supplied by Lab Rat Rocketry, LLC and does not extend to the electronics or any other part of the rocket.

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