RPM counter trigger wheel for Warco WM16 Mill

Improved trigger wheel for optical rev counter giving more reliable triggering
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updated February 5, 2024

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My Warco mill never read RPM reliably, due to the small holes in the original ring. This improved one gives a true 50:50 signal from the optical sensor and much wider range of adjustment for correct operation.

Print in something black for best contrast & reasonably robust as it's on a part that could get warm.

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