I didn't have too bad a time when I replaced my disks with just jackstands. I just made sure that I had them solidly placed. But my creeper had roken a plastic wheel mount, so I used a large piece of cardboard box. It was pretty easy to slide around on, and the security of having the driveway to work against was helpful, I didn't have to worry about breaking another creeper.

Scott

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Remember, it's not just a car. It's an Adventure.