I went to the Dayton Hamfest one year in a '68 GMC Handivan. I was headed home on I-75 that Sunday evening when the bolt holding the alternator mount to the engine sheared off and the alternator hit the highway at 55 MPH. There was about a half turn of the thread sticking out of the head on the Chevy 283 engine and I only had a few tools with me so I had to remove that hot bolt with my fingers while the engine was still hot. An Ohio state trooper had already stopped and told me that when he made the next pass in about a half hour he would call a wrecker if I was still there and either haul it to their impound lot, or to my home. The bill for that would have wiped out everthing I made that weekend, so I managed to get out the old bolt and found one that fit, but needed a couple washers to keep it from bottoming out. The alternator was still hanging from the wires, and had some damage from being dragged on the highway. I managed to get it bolted back to the engine and was just leaving when I spotted the police car making hiis next pass. :)