Crank thread gone!

[gb_wsko]

Just after a bit of advice really, I was riding today and my right pedal began to come loose. I checked and the entire screw thread on the crank has sheared, its a bontrager sport set. I'm reluctant to buy a new one as I can't see any new ones for cheaper than £70 so I was just wondering about any other fixes people may know of. I was wondering about drilling through the bottom of the crank and pedal screw bit and trying to fit a screw into it to sure it up?

[trevgbb]

Crank arm thread repair kits used to be available like these;
http://www.bollhoff-armstrong.co.uk/en/uk-bal/helicoil-threaded-inserts.php
but as bikes use a cycle specific thread, you needed a special, I don't know if these are still made, you could try e-mailing them to see, or try your local bike shops, they may still have stock.
This damage is usually caused by not fitting the pedals tight enough on assembly.

[xerxes]

They are still available, but they're not cheap and it's likely going to be more economical to replace the crank(s):

http://www.recoilshop.net/thread-repair-kits-specialist-kits-c-95_114.html

http://www.bikeman.com/Thread_Repair.html

More info:
http://thegoldenwrench.blogspot.co.uk/2010/12/repairing-stripped-pedal-thread.html

http://www.ehow.com/video_5773309_re_thread-bicycle-pedal.html