Yes been there done that, I did strip and rebuild my UR quattro on this lift, I had every thing striped off the car to replace fuel and brake lines and the first thing I put back in was the engine and gear box, and was very happy with it but when I was in the boot one day refitting I think the fuel tank and when wrestling it back on to its mounts the rear of the car lifted with very little effort, so I had a quick look round and put 3 or 4 concrete block in the boot, the lift didn't move it was the car that was starting to tip, but the uniqueness of the Ur quattro engine and gearbox layout did not help to the balance problem.
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