Problem with the power button of my drill craftsman 1/2

It sounds like the gear inside sheared the teeth. You can check with Craftsman to see if you can get a replacement gear.

Lock the spindle (small chrome button near the tool's nose or lever at the power switch). You'll probably need to rotate the spindle by hand as much as one full turn as you do this, to get the lock to drop into place.

With the spindle locked, use your supplied wrench to turn the collet nut counter-clockwise (as seen from the cutter end) about one full turn. The collet should now be plenty loose enough to release the cutter / wheel / drill.

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http://www.ereplacementparts.com/

Sure it can be fixed. Here is a link that you can get a diagram and order parts. It is prob just the brushes.

go to the sears site and you will find the manual button, click it and when prompted enter the model number of the drill. mine is 315.116890 for my 19.2 volt drill.

replace the trigger. you should be able to find one at craftsman website. if not call te costumer service there.

Try heating it up with a torch and tapping it off with a punch

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Yes it does have a Morse taper and you can remove it by gently hitting it with a rubber or nylon mallet.