At home flywheel balance....

If you were talking about a steel flywheel then very little of this would apply. Since you're talking about an iron flywheel, and given their demonstrated potential for disaster you would do well to set your bravado aside and give them the respect that they require. Iron is subject to brittle failures when loaded this highly. The results are well documented. A laise faire attitude isn't going change anything except potentially your nick-name.

I'm not saying don't do it. I'm saying be aware of the potential for disaster and be cautious about what you do and how that might effect the outcome.

Auto's are no less immune from such a catastrophic explosion.

OTOH, most of your posts seem to be more about poking the bear and less about the actual act of doing what your proposing, so perhaps you've no intention to do any of it and you're only trying to ruffle some feathers. In which case I'm done here.