Why not ask the posters above you? Looks like some of them also believe (and provide proof) that this in fact is a repost in a way. The mechanics are obviously the exact same only the tools are different (ledge, gate, stump, whatever).
Still I must agree that after a short search ( and that actually means 1 shot every 45 seconds) I had a hard time finding the original Thread linked in this one.
So Thanks alot for sharing, OP, but still it 'only' represents an addition to the original method itself.