Stripped bolt holes seem to be a very common problem. I only have one bike that has all the original bolts and screws. Most often I find a few US threaded pattern bolts or screws used as a substitute for the lost metric one. If it had not been taken in and out too many times, I can sometimes get lucky by rethreading it to the correct metric size and get it to hold ok, but not always the case. Especially the flywheel cover bolt holes. I have one project with only one good hole, all others are oversized. Anyone had luck putting in a sleeve? Do they come that small? Thx!