I have a Craftsman 12-1/2" Planer/Molder, model 351.233831. Recently I went to change the planer blades and cannot get the blades or the gibs out of thecutter head. Unfortunately, during my last move that is the one book that seems to have gotten lost. I have loosened all of the gib screws and nothing wants to budge. Can someone please provide some insight on removing the blades and gibs. Thank you.