Hermes knob - a solution

Impatient for a machined aluminium replacement, I tried a softer, more easily worked material. Ready-made shapes sprung to mind: draughtsmen (like you play draughts with),  a wheel from a wooden toy (which I didn't have) or some kind of turnery for cabinet makers. The drawer pull won the day for having a centre guide and I got them from the same shop I get replacement bushes for my Olympia SMs. Wonder if I could get them stock ribbons?