Review on DEDC Universal Jack Adapter Pad: Pinch Weld Side Frame Rail Protector (1 Pack) by Cody Cobbs

It's expensive for what it is (a piece of smelly Chinese rubber) but it does the job. The grooves aren't really deep enough to be used for pinching welds. Also, the larger diameter makes it unsuitable for positioning on every weld I have. I don't think it was intended to crush welds in any way. I only mention this in case you are looking for something to clamp welds. This is a good piece of rubber to put between the jack and the flat surface of the car frame.