Originally Posted by Rural Roadie
Bummer on the knees.
I have a tired looking Dura Ace crankset 7400 series with the flat arms would be perfect for this, I might even have the taps. Just another winter project.
Actually you might not want to do this: IIRC, Dura-Ace 74xx cranks are flared around the pedal hole and narrow along the arm, which means there won't be enough metal around the new hole. You want wide, as well as thick crankarms. Flat isn't really a problem as long as the thickness you get after spot-facing the hole with a 19mm miller is sufficient. In my case, the cranks have a V profile, and after facing the area around the new hole completely, it ends up 1.5mm under the original one.
You also want to avoid modifying those new hollowtech arms, as you might end up drilling into the hollow core.