Ok... so I have an old set of XTR cranks that have Shimano's old self extracting bolts. The system is on an octalink BB. I was wondering if it is possible to replace the self extracting bolts with stand crank arm bolts (and if anyone has done this)? I get an odd creaking from the cranks occasionally when I pedal; I have tried a diff BB to no avail. This is about all I can think of that would cause it - other than the splines on the crank arms themselves being worn out. Thoughts?