Professional woodworkers often don't use pads on their clamps because they know how to set them up without marring the wood. But if you prefer to use them for pipe or bar clamps, you can buy some or make up your own. Scrap rubber, shoe soles, even old mud flaps, can do the trick. For pipe clamps, cut out a slightly undersize circle to fit over the pipe using a sabersaw. Next, cut out the perimeter about 1/8 in. oversize. Then make a slit in the pad bottom so it can stretch over the pipe without taking off the jaw end.
For a ceiling fan to move the right amount of air, its blades should be set at a 14 degree angle. Blades set at a 10 degree angle will simply slice the air, while blades at a 20-degree angle will meet so much resistance that the motor may burn out.