Can it be done? I need to take the spring hangers off my 1 ton parts truck. If it matters, I can get at the hangers from above because the wood bed of the truck is all rotten and/or not there. What kind of head/bit/whateveryoucallit should I use. Also, how do I use a air chissel? I've never used one before... Thx Sorry for the confusion I was thinking spring hangers in my head but wrote perches.