When use my Torges seats and the rope wants to slip, I tie a piece of parachute cord around the tree with a loop on the back of the tree and make it super tight with a trucker's hitch, then run the seat rope through the loop. I find that Torges seats will always make a little noise until they settle. Mine are not very elaborate, just an old or odd chunk of 1/2" plywood, with two small metal square corner braces to bite the tree. I get them at the hardware store for a couple of bucks for four. When I leave mine on public land they always get stolen in a short time. Not a big investment lost, but the Aholes kick down my natural blinds that I build as well.