Originally Posted by dsbrantjr

Remove the bolt and use a standard threaded crank puller, or a pair of Jacobs chuck wedges.

Originally Posted by Crankycrank

+1. I learned to not rely on the self-extracting caps as they are generally fairly flimsy for the torque usually needed to remove a crank. Many have bent or broke their self-extractor caps and feckered up the crank threads. Stick with a proper crank puller.