Originally Posted by
surreal
The threads appear to be intact only a few mm down from where they begin. However, they seem to be damaged at the point of engagement: cross-threaded, i reckon. I may be able to retap it, but i bet a good tap would cost more than the cranks are worth.
You can turn an old bolt into a tap, you know...
Grind a bit of a taper onto the end, then cut some slots into the threads with a dremel's cutting disc.