I've tried a lot of those Big Wheel, engine in the rear, 22 and 24 self propelled(SP) mowers including Sarlo, Johnson and Yazoo. I've been looking for a weight balanced maneuverable SP mower for trim and not found one I've liked or kept yet. I've decided I could design a better, simpler mower along those lines than what I've found so far. Does anyone know of manufactures that are interested in new ideas and good to work with, or just good companies? I'd like to shop around my ideas. Or is anybody here interested in working on a new 21 to 22 mower that could sell in the consumer market and know how to go about it? Ron.