[Clem Clement]

Take yours out of the car. Take the band off and inspect things. See that the brushes have good thickness and are in place. See if it looks or smells burnt. Looks for good wire insulations. Put the battery to it and run some crocus cloth over the commutator surface while the starter is turning. Copper should be very shiny and no hoppity hops. Use a wire brush from a Dremel to clean the brass stud. Clean the mounting area and be sure you have the ground strap. Cleaning is the key.

I refreshed 5 starters this week. Not rebuilt. Cleaning solved most of the problems.
One was frozen solid. Lots of penetrating oil helped as well as cleaning the bearings. One brush was hanging loose. It spins fine now, but it surely will need fresh bearings to be dependable. I run the Bendix units thru a lapadary tumble. All cleaned up fine including the slider spring after some coaxing.
clem