I have some 4x10 timbers that are slightly out of square on their edges so I bought a 4 3/8” wide power planer, both to plane the edges smooth and hopefully square them up to the faces. Has anyone made a sled to run the power planer down the 3.5" wide edges, squaring them up? Or is there another technique I could use? I haven’t done this before so would appreciate any pointers or tips!