Originally Posted by
andr0id
Ah cool, and Recoil, which is good stuff too. So it looks like the kit has most of what you'd need.
However since we're changing the thread direction, I'm thinking that most of the existing threads should be removed with a drill before attempting to tap in the opposite direction. I'm thinking it would be best to do this on a drill press with the crank clamped down perpendicular using the existing hole as an alignment guide. Good thing I know a machinist....
6500 series Ultegra is looking like a strong possibility....
There is also this kit:
Unior thread repair kit
And these drills:
Reamer,
Drill
I was thinking about using DA 7400 cranks since I already had a set here and only needed to buy one triple and one double set to complete the tandem crank set. They are hard to find in good condition.