is there anyway to unscrew an allen screw after you've stripped it round??

it depends on if it a flush mount screw or not if it is you can try an easy out. If it isnt you can try an easy out or you can notch it with a dremel and use a screw driver or try a pair of plyers but try the easy out first if you are going to do it yourself if it is real bad take it to a tech and have them look at it

Sears. Craftsman makes a nice set of screw removers.