I don't pull the shims on the shaft, as you'd need to install the bearing and start using the height adjustment screw. Not everyone still has the bearing, and I can't supply them at the moment.
I solder the comm/pole junction, true the comm (and remove any arc damage) and install new brushes. They do run a bit quieter, but the 490 at it's best is louder than a 480, as it has more windings, more torque and turns a little faster.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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