Allen key handle various sizes
thingiverse
Rough copy of a modified Allen T-handle made from the auxiliary tool that came with a set, specifically this one: https://www.amazon.com/Numkuda-Internal-Hexagonal-Auxiliary-Labor-saving/dp/B07K33X7SW. The length is slightly extended than the original, and I took some shortcuts on the more intricate arches after completing the first one. To assemble this T-handle, you'll need an M3 x 20mm screw and an M3 nylock nut. The nylock must be fully seated in the longer section of the handle. Next, simply tighten the screw as far as it will go and then back off until the smaller part becomes free to turn again.
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