I'm with Tom on this one. IMO, any green with serious thatch, 1+ inches, is going to scalp at ultra low mowing heights. Speaking of mowing heights, because of mower types, roller types, gauges and the guy doing the measuring, comparing mowing heights from one course to the next is tough to do with any meaning. For instance, we mow our greens with a Jacobsen triplex with grooved rollers at .115, we do our clean ups with a John Deere walker with smooth rollers which we learned through trial and error to set at .135 to match the cut of the triplex. Walkers and triplexs don't cut the same just as differing brands, angle of bedknife and roller types all affect the actual height of cut. BTW, why would anyone ever cut their greens at less then 1/10 of an inch. You can certainly find speed through drying 'em down or rolling rather then seeing how low you can go. Just my not so humble opinion.