You are hilarious at the end. Built the thing but don't have a tree to push over. Idk why, but I've bought/made a ton of stuff just to be in the same situation. Just waiting to use it.
I try to plan ahead lol. Especially If it's something I don't have a lot invested in and looks like it'll be handy for something in the future. More tools in the toolbox.
Nope not pinned at the bottom, in theory if the angle is correct and you start to lift the blade as you push it should work, but I'm curious how well it's going to work myself. I suppose I will find out the answer to that eventually 😁