I was going to suggest a small bearing splitter and a slide hammer puller. Maybe a local machine shop or mechanic might have one. Something like this. Bearing splitter and this Slide hammer puller if you can't get it loose by tapping on the collet. Maybe try a brass drift punch on the side of the collet. It is a taper it should come loose. I would also try clamping the collet with vise grips and giving it a good tap from behind like John said.