I screwed up. round ordered! I needed square ones for my jacks. I modified them appropriately. However, after the change, I'm pretty sure they work the same way. The disc is nice and thick so gravel and bumps don't damage it, see first photo. You no longer have to reach under the board to put it down. Simply lower the jack and the pad will be leveled to ensure perfect contact. They also work excellently on softer ground. Realizing my mistake, a few months later (Covid strikes again) the squares were in stock and I needed them for an upcoming trip. I'm not suggesting any change, it required cutting, grinding, fabricating, welding and going to the hardware store for longer screws. The other photos show part of the assembly. Tip: Measure the width of the jack where it touches the ground BEFORE you order. I looked at the OEM graphics that came with the jack and they showed round pads.
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