Velognome's technique is shown in depth at the link below. It works, I used it today on a Peugeot Mixte that has seen a few NYC winters. You may need lots of heat. Get at least a 5" clamp or 6", the $3.99 one is too small to put any real pressure on the cotter.

The #1 technique mushrooms the cotter pin. Buying new pins is a crapshoot, either too big or too small.

http://hughsbicycle.blogspot.com/201...storation.html