Being a "po' boy" in the fifties, I rented one of them to refurbish a crank throw on my '51 Hudson Hornet.
Pain in the butt but it worked. Head off, (had to R&R the piston and mangled con-rod + compression release) grill and radiator out and a friend doing his best hand cranking the engine with a "cheater bar", extention and socket on the front pulley nut, shouted instructions from under the car. That's where I learned that removing metal with a precision grinder is a fussy, frustrating job. At least I got to do it laying down.
Just filed off some bumps around the gouges on the bottom of the barrel.
Bought my first 2" mikes for that job, "undersized" insert chart in hand.
I don't recall taking any precautions regarding grinding dust, just wiped 'er down afterwards, wha'did I know?
Had one of those "advanced", toilet paper roll filters, wasn't worried about a little grit.
Drove it for a few months, no problems, though my driving style did
mature for the occasion. I sold it still working well, (no noticable knocking) which was a surprise and great relief to me. Replaced it with a black '50 Chevy Sports coupe, white top, dual pipes, lowered and red fingernail polish painted inside the 2 side interior light covers, mood lighting....... pulled the lowering blocks for a "rake", cool man....
Bob