When I was working with my dad doing tree work, we cut leaners like this many times. If its leaning too far to pull it past center in the opposite direction of the lean, tie a rope in the opposite direction of the lean for the tree to pivot off of, then pull and fell the tree 90 degrees to the lean. It works great and your pivot rope keeps it from falling on your shop. And if for some reason your pull rope breaks, it doesn't slingshot back onto your shop. We used a rope come along to pull the pivot rope tight. Be careful with how much tension you put on it. Especially if its a white pine. I can't really tell from the picture. And also, NEVER make an angled back cut on a tree like this. If it sits back on the back cut, the pressure from the angle will compromise your hinge wood much faster as it puts a horizontal force and a vertical force on it. A straight back cut puts mostly a vertical pulling force on your hinge. A lot of people think the angle will hold it and keep it from falling better than a straight cut but this is not true. My dad had 50 years experience between logging and owning a tree service and I managed to learn a few things over the years of working with him on my days off.
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