Your flywheel should be 13 1/2" in diameter, so a 12" disc will measure 3/4" from the edge, a 11" disc will measure 1 1/4" from the edge, and a 10" disc will measure 1 3/4" from the edge.
I just measured a 11" and a 12", don't have a 10" but it should be what I listed.
Jim
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