I'm putting a new clutch and rebuilding the drivetrain behind my 400sbc. Well I decided to resurface my own flywheel and I was told to turn it down till the hot spots are gone. I have turned down around .150" to .200" off this thing and the hot spots seem to be going away but it looks like i need to take around .100" more to finish. 2 questions: Am i going about this the right way? and when is it too thin? I don't believe this flywheel to have ever been turned before.