Working in the R & D lab, I installed an extra set of blades on a 36 inch rear discharge deck.
How this idea started was the Horse Bug bit my brother. I gave him an old 211-4 cause one of his mowers was down. I must admit the 36 inch RD deck cut pretty nice. To small for me. He liked it so much he went on CL and bought a 208-4, cuts great too. Looking at those machines, the front of the deck is connected to the front axle and pivots with the from wheels. Sure seems like a nice design. (not to mention my brother is a nut about his lawn). I have been working on and off the last couple years on a 88 516H. Finally got it runnable and my brother came up and took her for a spin. (I think he is in love) but says he has no more room for another mower, but ask if there is a 36 inch rear deck that will fit. Well anyhow, I was working on a 36 just to have and thought if I put mulching blades on it to see if it competes. I seen a while back were a member used two sets of blades and thought that may give me that fine cut.
Some of my findings are; 1 makes more noise, 2 does use more power, 3 pulverizes the grass, super fine clippings, 4 does blow out from under the deck more, and 5 cuts pretty nice.
I had the height set a notch lower than usual and the cut pic it is hard to tell but don't look to bad.
I now some other members have done this and hope they share their thoughts.