Today in trying to remove my gear box, I removed all of the metric hex head bolts but the last one. It is one of the larger bolts at the bottom of the gear box. Unfortunately I stripped it out. Would a screw extactor work? The torgue value of these bolts are pretty high. I thought about cutting a slot in the top of the bolt and using a large screw driver. Any help or advice would be appreciated. Oh the engine is a 912ULS.