Apologies to Scrod for answering in his thread, but you might try finding some washers to fit between the inner bolts and the inside of the crank arm spider. Buying new bolts is only going to help if they are shorter than ones you already have. Also, you probably have a spanner like the one on the left of the pic, which is hanging up on the bolt. I have an old Campy spanner that is open as shown on the right that I can use in situations where the bolt is too long. Better quality cranks like the Sugino 75 have recesses on the inside of the crank spiders for the bolt shoulders that let you use bolts with serrations that eliminate the need to use a spanner.