Two years ago, I was drilling a 4 inch hole with a high torque drill. All was going well until the big 4 inch hole saw jammed and twisted both my wrists as the drill body rotated on the jammed bit. One part of my brain was saying: "let go of the trigger", while another part of my brain was saying: "something bad is happening so hang on tight". Anyway, sprained both wrists and it has taken over a year to get back to more or less normal.
I googled the topic of injury from drills jamming to see if there was any special treatmet for sprained wrists from drills, as compared to the typical sprains from falling. Found some frightening stories that would be funny if not so serious: one poor guy was standing on a ladder drilling a hole in the ceiling; the bit jammed and he started spinning around; the ladder fell out of the way; he kept spinning with the cord wrapping around until it yanked itself out of the wall.
I have not touched that drill since my experience, but finally had a need to drill a 4-3/8 hole in the floor to feed a 4 inch flexible dust duct through. To make the drill safer I made a long wooden side handle to replace the normal size side handle. The long handle can be braced against my body or in the case of the hole I drilled, braced against the wall. The handle is made of ash and has a 5/16 threaded rod running through it, that threads inot the drill where a normal handle could go. A copper ferrule made from plumbing pipe keeps the wood from splitting and provides a hard surface to mate agains the metal housing of the drill.
Drill Safety.jpg
Drill Safety (2).jpg