Dixie Chopper has a double blade setup. The top blade is called an X blade and the bottom H blade is flat. The flat bottom H blade fits in the X portion of top blade seem to work pretty well and have never seen one come off yet.In my opinion doubling up blades is a DYI guys stupid idea. What can go wrong? Can’t properly tighten blades, may come loose. Destroying the spindles. Not made for two blades. Safety, may destroy the deck or blades go flying. Don’t even give that idea another thought, you’re asking for trouble. Who ever posted that or is thinking about do it, should have a frontal lobotomy ASAP, and should loose his manhood.