I’m in need of some help please. I have an old AMT 12.50 planer. I lost my manual in a house fire. AMT company is no longer in business. I need to know how high my blades need to be so I can build a jig. I don’t want to keep taking it apart just to adjust blades because it takes 45 minutes just to get to blades it a poor design in that sense. Please any help would be great!