thumb screw finger turn bolt
thingiverse
This was designed for a flat head screw bolt with around 6mm thread and a head of 8mm (about) It's a good size for many projects but size to fit yours. For some reason I made it to fit a "V" cut on each end of the screw, this works well but a flat section to fit the slot would work too. the top and bottom push into each other and the bolt stays in place, no glue needed.
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