Originally Posted by
koolerb
Or if you want to do it yourself heliciol kits are pretty inexpensive. They come with a drill bit, tap, and heliciols. Everything you need but the drill.
You need to be very careful when drilling out the old threads and tapping for the helicoil that you are perpindicular to the crankarm. Doing it with a hand drill, it would be very easy to get off-axis in an alloy crank arm. You may do better to take it to a local machine shop, or use a piloted reamer, rather than a drill.