I just put slip knots on both ends of a piece of baling twine, threw it over a tree branch away from the trunk, and slipped the hind feet into the loops. Every now and then the knots would stick or the twine would fray and I'd grab a new piece. Since there's constantly some around and I'd often leave it on the tree to use over several weeks until it stuck or weathered too much I was never going to run out of twine. Gravity was helpful then and my hands didn't cramp skinning like they do now using my bathtub. If you just stick a bucket underneath when you split the belly flap the whole digestive tract falls out and I'd pull it loose just above the stomach and let weight take the whole thing into the bucket. Dump the bucket a good enough distance away so it won't smell horrible in my butchering area if I wanted to do some frequently. Much better system than having to do it indoors now. I saw someone made a hanging stand to set in their shower for butchering that same way but indoors. I did learn if you pull the skin off don't pull directly at yourself. When it gives around the front legs and neck you will get splattered with blood. Pull next to you and as down as possible. Removing the front feet first helps.