Originally Posted by
Chief Tiff
Please don’t have a go yourself; either toss it or take it to a repairer.
If the motor still turns freely by hand then it’s probably a combination of the brushes and the commutator segments scorching. Possibly repairable; maybe just needs the segments cleaning and the brushes bedding but if the commutator needs skimming the job would likely cost as much as the tool. There is a very good chance you are going to end up taking this to the bin; but try a toolshop and see if they would have a quick look and quote for a repair.