Ever wonder how you can work on your car with a 10% chance of death.

I built these bad boys so I could work on my car with the ultimate ease. At the time I built them I didn't see the almost fatal flaw in the design. Only after I took these pictures did I see how retarded I had been. See if you can spot the flaw. Given now that I have fixed them there is 0% chance of being smashed and they do work very very well.