(I still have all this in the corners of the sheds....)
Dad had a circle saw - buzz saw - on the H tractor, for cutting forewood. I think most of you here would cringe at the danger of those things. I spent 3-4 days every fall as a kid taking the cut wood away & throwing in trailers & trucks. Life is good when you pay attention or die. You learn to pay attention.
He made an oak plank for it, that would bolt on the side in place of the cradle. He could slide the raw wood posts on the plank, and cut points on one end so they would pound into the ground with a sledge. The other side he even trimmed little miters off, so the post wouldn't split from the maul pounding.
He could shape up 50-60 posts in a short afternoon, looked like factory made posts, most from reused telephone poles or home cut white oak branches.
There was no kickback device, no guides, no guards, no nothing. This was just a flat table on a 3-4 foot rotating blade on the front of a tractor powered by a flat belt & pulley. Pretty much a tractor-powered 4 foot table saw with nothing but the blade.
Life was different back then. You would all be very, very scared seeing this setup..... That one actually got my notice as to what happens if.....
So anyhow, yea I know what you are talking about. Don't have any help for a chainsaw jig tho.
--->Paul