Bent Crank arm - drive side.
Bought a 2nd hand set of Dura Ace 7800 cranks on Ebay awhile back, only to discover today that the crank arm on the drive side is slightly bent. When fitted and switch to big ring, the crank arm is actually under the chain. We used a couple of spacers to move the shaft out slightly, it is okay until you move the chain onto the bottom ring with the chain on the big ring, the arm slighly rubs off the chain. Is is possible to get the crank arm straightened? Or have I just learned an expensive mistake?