thanks for the links everyone. Tom, i was looking for to make a pully/biner FC in order to really cut down on friction, but I'm a little unclear about it. On a double ring style false crotch, you run the rope through both rings. So, with a biner and pulley set up, would i run through both as well? Because that sounds like it would still be dragging on the biner and not using the pulley. Or would it run through the pulley alone? Maybe I should just buy one of those leather deals like Panthro got and call it good. But if I can throw in a pulley, I could save my rope, my energy and the hurt on the tree. I will try and draw a picture of my confusion.