Not on a bench but changed a master cylinder it in my CJ7. Had to screw with the dreaded brake switch. It fell apart into 4 pieces I think it was. Put it back together and it works. Bunch of plastic wood pellet bags as a pad on the sill, legs on a bug trash can. It sucked but it worked.
We do us a ton of baseball around here so my little CJ8 1/2 is turning 9. I always make the kids some little "Dad gift" so he's getting this tomorrow. It started out as 1/2" die. brass round stock, took a few spins on the lathe and presto - here it is. Now to only get brass balls to go with the brass bat, ha ha.