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A while ago there was a thread on our bumpers ( http://www.chiefdelphi.com/forums/showthread.php?t=41117&highlight=bumpers ) and people were wondering how they worked. I was bored last weekend so I Inventored them up. They work based on the concept of a parallelogram. We used the kit chassis and attached two or three modules on each side (depending on the length). We ziptied on a metal grid to each side and some sticky rubber on top (see next two photos). Whenever somebody drove into us the idea was that they would get "stuck" onto us via friction and we would lift up one of their sides slightly, lifting their wheels off the ground and making them lose traction and allowing us to push them back. I wouldn't say they worked nearly as well as we'd hoped, but that was our low-tech and very legal (at least in '05) solution to wedges! Hope that clears things up. I'm still quite fond of this project. 