Right. Square taper crank arms, have been on my 5 since at least 2004 and now BB is dead. Drive side crank arm came off easily, but I goofed on nds - didn't get the bolt in properly and completely stripped threads. No amount of whacking the arm will loosen it off the taper (bolt is out).
How do I get the arm off? The only thing I can think of is heat, but don't want to damage frame.

