Retrogrouch in Training
Join Date: Sep 2004
Location: Knee-deep in the day-to-day
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I got a frame with only one crank. The other had been removed, but the NDS extractor threads were stripped. I used it for hanging the frame while I painted it and then built it up save for that last arm.
Remove the crank bolt/nut and go out and torque the hell out of it. I REALLY had to push and alternate with loving taps from a claw hammer. It finally loosened up. Be warned that it may very well round out the spindle hole, so it's a last-ditch-never-wanna-use-this-again technique.
On the other hand, my mtb cranks loosen up all on their own, even after I torque down the nuts.
Many shops can tap threads in the crank or even retap a larger diameter thread if the original threads have been stripped or crossthreaded.