Originally Posted by
captainben44
Thanks for your answers!
1. It's a good tip and I wish I was aware of it before hitting so much with a hammer....that's my mystake. Now the clotter is badly damaged and hitting with a hammer seems hopeless. I will have to find a special trick to remove it

You're right about the spindle, it will be hard to saw....that's tricky !
2. I don't really want to harm more the bike...I might get a proper tool which is not so expensive anyway
3. Sounds good! Will check out the exact dimensions when I the 2 first issues are sorted out.
Cheers
Ben
The trick now is to support the crank arm and then hit the threaded end of the cotter back and forth until it breaks off. Then place a flat punch on the remaining portion of the cotter and hammer away.
When you get the replacement take in the old crank arms/chainwheel, spindle and cups. Any decent mechanic/shop should be able to provide you with the perfect replacement given the old one as a reference point.