I used to spend a lot of time working one of those manual changers, only it was a heavy duty commercial model that dated back before everything became air powered....
Only problem was the damn tourists standing around watching
One of my oldest memories is of my grandfather changing tires. He was a retired blacksmith... he could do just about anything with minimal tools.
His tool kit for tire changing was a bumper jack, a 2X4, a couple crowbars, and a small sledge hammer. He would lay the tire flat on the garage floor and put the foot of the bumper jack against the sidewall. Then he'd put one end of the 2X4 on the jack's hook and the other end against the ceiling. Jacking the jack would seperate the tire from the wheel, and judicious applications of the sledge to the crowbars would allow him to lever the tire over the edge of the wheel and remove it. Similar process to put the new tire on. He had no compressor, so the last step was to take the tire down to the corner store to air it up.
He had no tourists standing around watching. Just me.
Oh, I don't believe OSHA even existed back then.
They only go back to what...'70?
DD