Someone showed me a way to check the jointer. Joint the first 12" of a
board, pull it back scribble pencil marks on it. Turn it around and run it
through the other way. It should remove the pencil marks on the second pass.

At any rate I am working on a jointer manufactured in 1944. It takes 2-3
passes to remove the pencil marks.

Can anyone help me with troubleshooting?