Fine story but - a good sign of a healthy motor is it literally jumping to life when power is supplied. Though some are supplied with soft start motors.#1 Wire wheel brush on my vintage bench grinder.
Old Craftsman Block grinder.
I bought it at a garage sale & the guy was happy to plug it in for me.
Had it cradled in his arms, flipped the switch & said "Well it USED TO WORK"!
I told him, it is working now!
It's so smooth, he never knew it was turning! Lol!
Gave $20 for it.
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When I buy a used tool with a motor I plug it in and hope it literally jumps to life. Though I doubt a small grinder has a large enough motor to really jump. Now a 15 amp "Skil saw"? Different animal.