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Measure the diameter of the pulley
Multiply by pi (3.14 is good enough)
cut a strip of paper to that length.
35 degrees is almost 36, which is 1/10 of the strip length.
Now you have a strip of paper that will show you where to put a mark on the pully.
Put a mark with a silver sharpie. Should reflect more that the base metal. Or file a small notch.
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