We also can't use screw in's. I have quite a few strap ons. Steps that is. You don't have to get them that tight on the tree. If you use a 4 point harness while your putting them on it's alot easier than trying to hold on to the tree and do it like I did last year. I space mine out from foot to just above the knee. I usually put the first one pretty high off the ground. I'm pretty tall and long legged and nobody else in my camp is and that will keep them out of my stands.