A 1/16" flat washer thickness would correspond to about .060" being surfaced off the flywheel face. That would be a HUGE amount for a machine shop to take off- - - - -half of that or less would be much more likely.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!