So I helped my friend get a sweet deal on a used Trek a couple days ago. Foolishly, I encouraged him to buy some pedals for it, not realizing that he would install them himself. Seems he stripped the hell out of the threads on the left crank
So, I'm wondering how hard it is to put a helicoil into a crank. I have access to a drill press, mill, reaming tools, etc. Would an LBS sell me just the insert? If not, how much do they charge for putting one in?
Failing that, does anyone have a silver 175 mm square taper left crank arm they don't need? I have several, but they're all 170 mm.
PS- loosescrews.com and ebay don't have any appropriate 175 mm arms. Any other sources?