Very Good.

You may want to take a peek in there ..many guys change out the brushes...may even just be gunked up..WD40 and some compressed air often works. And lube the bearings while you are at it [ ATF]. The shaft should be very easy to spin by hand.........if it drags at all, that could also be part of your problem.
You have a handle on it now..

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A Dalton