So the flywheel came apart and that caused some collateral damage?
If the governor was working, it must have blown the flywheel at only 3,000 rpm, which seems just about inconceivable unless it was cracked. Also, that isn't the normal pattern of a bursting failure, it looks more like a crack propagation failure. Is there any way of knowing if there was a visible crack before you ran it?
And are you sure it is a good idea to sell parts that may turn out to be of the same quality as that bolt and flywheel? Both of those failures were capable of causing personal injury.