How's the fit of the bearings on the shaft? If it's too loose, the shaft can "walk" around the ID of the bearings. But that's usually intermittent and can be stopped sometimes by smacking the tool while it's running.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.