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How to fix a Challenge Xtreme cordless drill CD1218J?

I have a Challenge Xtreme cordless drill CD1218J and does not unscrew (button seems to be stack).
The button on the handle is stack and I cannot push it in so that to unscrew.
The drill works fine clockwise while screwing.
I cannot make it unscrew.
Chris Papas, April 2017
How to fix?

Take it apart and unstick the stuck [stack] button.

Good Luck..., April 2017
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