I have had a similar problem with my hitachi m 12 v. I ground the end of a long flat piece of metal so that it would fit around the collet. Mine had sort of a lip on it that the home made tool would fit under. the thing I made was shaped like an open end wrench. I had to grind it down so it would be thin enough to fit under the lip and just fit around the collet. Then I hit it with a small hammer. a few times on each side of the collet. I kept going from one side to the other until the collet popped out.
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