...just working on my new-to me bone stock Skorpion with 1,500 miles on it (:-)) and I had the classic spinning gas tank bolts. On a whim I popped a 10mm socket on my 1/2" drive impact wrench and gave them a spin....they unscrewed off without a problem. I think the impact vibration helped them free up, but all I really know is they weren't coming off w/out the wrench and they popped off like nothing with it.
Sam