Originally posted by stewartp
When using the crank puller, always make sure you have screwed it in fully before applying the reverse torque to pull the crank off the square shaft.
This is because the alloy used on the crank is relatively soft (probably to help with lightness) compared to the threads on the puller. I once screed the tool in finger tight, and proceeded to pull the threads right out of the crank. One new chainset required.
I did the exact same thing last year. I was in a hurry and didn't take the time to make sure it was screwed in tight enough. Lesson learned.
I have replaced my BB cartridge several other times without incident. As easy as 1-2-snap...