pictures
I'm not real good at drawing things and these aren't perfect, or even perfectly to scale. but they are pretty close.
I tried to make a little allowance for dawgs. but probably isn't exactly right.
one picture is what could be done with a twenty inch bar without getting highly creative and notching the backside of the tree.
the other is of a 32 inch bar with a bore cut behind your holding wood and walking the powerhead around the backcut.-- just one way it could be done, but for sure the easiest to draw.
I wouldn't want to try a fifty inch tree with a 20 inch bar. A twenty-eight could do it, but a 32 in my mind would be the best length- realativly readily available and not so long that it doesn't work for everything else you need to do once the tree's on the ground.
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pologies for not having the time to figure out how to insert the actual images into this post. gonna have to figure that out again some other time.