Thanks all for replies. It's Sod's Law that all 3 of my heavier drills failed for different reasons about the same time just when I needed them; one was brand new but that's another story. I was only planning a DIY repair job on this one, obviously not worth spending much. None of the online...
I was given a very solid B&D BD155RT electronic hammer drill. It only worked intermittently, for a rotation or two at most, and does not even do that now. Have cleaned commutator and replaced brushes to no avail. All visible wiring and mechanicals look in good shape and the trigger switch seems...