Flywheel Fun...

Doing a freebie job to help a friend, her brother paid for the parts, but as he's a chebbie racer, said she don't need a flywheel.... my Bro helping me tried to scuff it w/ a 4" angle grinder.... wheel was dead. It's slick otherwise, except for the long humpty circles... is there anything I can recut this with at home? Thanks, Yall! And Happy Thanksgiving!

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