When I used to change my tires before I had a tire machine I used a big bench mounted vise to break my bead then 2 big screwdrivers with 2 chunks of leather. I put the leather between the screw drivers and rim to prevent scratches. I partly inflated the tube so it wouldn't get pinched before I put the 2nd bead on. I did that on an old piece of carpet. I never damaged anything doing it that way.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!