In article , D.M. Procida wrote:
I have a left-hand pedal crank with a fairly badly stripped thread.

Bearing in mind that I hope never to have to see a stripped pedal thread
again (and certainly, not see one again at the bottom of a Spanish
mountain, but that's a different story) is it even worth trying to
repair it with a kit or getting it repaired by a garage?

It was only a cheap crank to begin with.

For a cheap left hand crank? Not worth it. But it can be done:
http://www.highpath.net/highpath/cycles/repairs.html