Square taper crankarm's thread is stripped, what now?
We have a Santana tandem in for a tune. While installing new chains we discovered that the eccentric front bottom bracket would need adjusting. We have to remove both crank arms since both sides of the bottom bracket have to be adjusted equally. That is when we found that the captain's drive-side crank arm is stripped so a normal crank-puller tool won't work. We tried to get a gear puller from Harbor freight in there but the arms are thick and don't hook the back of the arm very solidly. We have to be careful so as not to damage this original, 30-year-old bottom bracket.
We also tried a torch thinking the arm might heat up more than the spindle...to no avail.
Any suggestions for getting this arm off using other methods/tools? Your creativity will be appreciated.