Hmmm. I know my dads old Craftsman Radial arm saw had a centrifugal switch on the back of the motor. Basically a couple of wings that once the motor came up to speed would (i assume) turn off the start capacitor.
Since they were open to the air, they would get clogged up with saw dust everynow and then and would fail to operate properly. Blowing them out with a little compressed air would 'fix' the problem..
Just an idea...
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