Had to re-register since it's been a few years since I popped in last.
Because of an artificial knee, I would like to extend my right pedal by about 20 mm.
So, I went down and got the local welder to rethread a 9/16 bolt to 20 turns to the inch, with the same treatment for two nuts welded onto the bolt. It did the trick for about 45 minutes. Now the thread in the crank is up sh1tters ditch.
Your suggestions now would be extremely welcome.