We're probably all familiar with the admonishment not to put metal to metal when jacking up or supporting the car on stands. The general advice is to use a piece of wood between the hydraulic floor jack disk and the frame or whatever part of the car one is interested in.
If a suitable piece of wood isn't available, I instead use old paperback books, about 1/2-3/4" thick, thereabouts. They work just fine, and there's a ready supply at the used paperback bookstore not far from home, for something like a quarter. I even use them in place of the rubber jacking pads. Somewhere, I can't recall just where, said that those really shouldn't be used to place jacking equipment (for whatever reason, again I can't recall), and instead the pads should be removed but the lifting of the car should be done at those same points. That's what I do, take out the pad, and put a paperback in between.
So if you still have de Tocqueville's "Democracy in America" hanging around somewhere and somehow you figure you won't be finding the time to reread it...