Thule M8 Knob with Cap

My rack knobs kept breaking, and I kept on replacing them. Then, one broke and I lost the roller (like in the picture), so enough was enough! These PLA knobs are very tough, and with an improved profile so that they are easier to crank. Requires an M8 nut, I used the ones from my destroyed old knobs. The cap isn't required, but looks nicer and keeps the weather out.

Tolerances are tight, I used a vise to press in the nut and cap.