3/8 Inch Bolt Knob
thingiverse
Looking for a jam bolt or an adjustment screw? Try this simple knob handle, made specifically for 3/8" bolts. The head of the knob fits snugly into the top and the insert slides smoothly over the bolt. You can secure it with glue if you want, but it usually presses fit pretty well on its own - designed to work seamlessly with a standard bolt.
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