I am building a large ski resort with multiple fixed grip chairlifts and one detachable I am having problems with the fixed grip and I haven't done more than the frame on the detachable. the problems I am having with the fixed grip are simple, but I cannot figure out how to fix them. the chairs jam up a lot and the rope derails easily, both of which can damage the entire lift. on the detachable I need a small grip that can detach and reattach at the terminal, but flow easily over support and hold down sheaves. I am trying not to spent too much, but I want all of the lifts to work right. I am using power functions XL motors to power them.