The clasp and thumbscrew for our iPad tripod mount got lost. Since it's a rather high quality aluminum tripod, rather than buy a new one, I designed this in Fusion 3D and printed it on my MK4S in 0.15 Structural mode with surface ironing for smooth faces. Works very nicely.
An M4 hex Screw goes inside the hole in the thumbscrew where the hexagonal protruding bit engages it (tolerances are a bit tight). A Washer sits in the lower circular plate which is superglued to the thumbscrew. I considered designing a snap fit part for the bottom but decided to keep it simple with superglue.
The author marked this model as their own original creation.