Fear Porn! M11 bolts are available, g--gle them, or dealer.Your buddy didn't get them from junyard when he got the bellhousing? Torque to yield really requires the tool for the bolt head-but as you noticed, hardly anyone does it that way. So far the bolts have survived 4-5 cycles. Most clean bolt and crank, and use locktite as the lube. An old beam style torque wrench helps on install being if max torque for that bolt ( not application) is say80 ft lbs when you are moving to angle don't exceed that.You are more likely to snap the bolt or pull the threads out of crank rather than them falling out from being loose as long as threads are clean and flywheel fits nice. What were your findings on Measuring throwout relationship? Hate to see problem continue when you were that far in it.