Where did you see screw in hooks are OK. I have some 3.00 hooks from Lowes made to hang items in a garage. I put parachute cord through the top hole, wrap around tree twice and tie a square knot. Time to leave, pull one end of the cord, square knot releases , take them with me. Never had them slide down tree, just took 2 down that had been up tree since middle of archery season, still tight. I hang a heavy pack at times, no problem.For you treestand hunters, since we are not allowed to use screw in hooks on public land, what do you guys use to attach your gear when you are up a tree?