The ones with black center is for Sram (X7) shifters. These use Sram bearings and that black spacers from broken original Sram wheels.
The one with chrome center is for Shimano (SLX) shifter. These use Shimano hardware from a worn out wheel.
What motivated me is it. Sram wheels broke before being wear out. And they are expensive!
I am not a bicycle person but I am a machining fan of all types of machining. Great video. Now my question? The milling head for the lathe, is it your design?
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