grinding sound from the starter

took my car into the shop for a dying/ weak/slow cranking starter. I now have a new starter with a brief grinding noise at start up. coming from the starter.. they are looking into it. they even told me--- MAN it did not sound like that when we pulled it of the rack and test started it. so they needed another day. i mean it started fine for years, even when i dropped it off and when they drove it around. whys it now grinding a bit. its odd.

UPDATE--I was told the flywheel is showing wear...

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