The PTO diagram is very helpful, but I would probably add a note to it stating that the brake flange has been omitted for clarity. The first time you look at the magnetic clutch it's not immediately clear where the gap needs to be. It took me a few minutes to understand that the gap is not between the brake flange and the driven disk.
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IH 1650, CC 1210, 1610 and Bolens 1257
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