I've had moderate success with thoroughly degreasing the collet, then, take hot glue gun and force the melt into the slots in the collet. After the "glue" (its plastic actually) cools, then trim off the excess with a sharp knife on the outside. It is tricky to trim the ID but it needs to be done as well. A piece of thinwall tubing that fits the collet, with a properly sharpened end (on the tube ID) can be spun slowly and forced down the ID to trim the excess.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)