Rapidstrike grip heel - captive nut
thingiverse
The design features a grip heel shape identical to the original, but now accommodates a 12mm countersunk M4 machine screw and matching hex nut for added security. Unfortunately, the friction fit on the original model prevented the sides from closing completely, necessitating a more substantial fastening solution. To produce this revised design, print it upright. Note that I've used filler in the accompanying photos to conceal the seam between the printed parts.
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