Nerdy / Hurdy Gurdy Knob

thingiverse

The Nerdy Gurdy requires a traditional-sized knob that's specifically designed for use with an M8 threaded rod. This particular setup doesn't need any bearings, as the stud is securely locked onto the crank using two nuts. Next, a washer and nyloc nut are used to fix the knob in place, allowing it to move freely. What's more, this design enables you to utilize the standard M6 bolt, thanks to the added bushing component.