T Buttrick T I am both and have been for a long time. What you see is Rube Goldberg or Mickey Mouse work. You did fine the vibration for this motor to say the least. Is the bolt stretched? The picture give the look of this. I think what you really left out was PRIDE of WORKMANSHIP. Using the top fasteners like ARP. Taking your time, measuring 2-3 times, test fitting 3-5 times before installing for the last time. Removal of shape edges and rough ones. Craftmanship, we have some of the best assembler and builders on the forum, we have a couple of clunkers too like in any bussiness. Those don't look like ARP bolts. As far as the flywheel opening it looks like a high speed grinder was used to make this flywheel fit on the crank end. You would think that people like this would become better at there performance ability of building a better motor. Some do and some just want the money and don't care. The only way I see to remove them from building motors is to bring them into the light. Their story should be interesting to say the least. Over time they should also be out of bussiness.
The other issue is we have short term memories and beleive in giving second, third, fourth, and so on chances to redeam themselves and it doesn't work for a couple. Worst part is they have families and are most times the main bread winner of the house.
I do both, and try to help othersbeome better at this craft. Rick L.