I'm in process of trying to make one for when I install my 5-speed. Have two fabrication paths I'm going to try.
1) 3D printed blanks that need white paint, then I'm going to try applying some casting resin.
2) Printed 5-speed logo on photo paper, glued to a disk and covered with casting resin.
For both ways, once casting resin is cured hard, it can be sanded convex and polished.
If either process works, I'll post pictures.
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