Many, many, years ago, I was working at a really sh!tty GM dealer in Ft. Stockton, Texas. One of the other mechanics had a Snap On IM-5 1/2" drive impact that he absolutely hated, so we set out to destroy it.
Step #1 Clamp the square drive into a vise, and tie the trigger down and go to lunch.
Come back, still hammering away.
Step #2. Go to brake lathe, get metal dust, remove air hose, pack as much as possible into body of impact. Repeat 3 or 4 times.
We could NOT destroy it!
This is the same garage where we took a brand new Vega for an 85 mile test drive, and would take the K3500 Chevy pickups destined for the Firestone test track on off-road 'adventures'.
The owner was pretty much a shyster, as Ft. Stockton is out in the middle of NOWHERE, and I-10 was not completed thru town, and tourists were at his mercy. I had a chance to go to work for the company I have been with for 33 years, and except for one time when I went middle age stupid, and quit for 3 years after I had been with them for 18 years, never looked back.