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.
(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.