To be honest, I never looked at it. It seemed the way he described it (and it wasn't a Winnebago dealership so he may be off on this) is that the slide is pushed out and drawn in by hydraulic cylinders but that there are also large springs that expand and contract with that. He said it is these springs that are supposed to hold tension on the slide assy. to keep it from "tipping out". Something I guess I'll be looking at my next trip over to the coach.