my crews are having to spend too much time on the lawns because the grass is growing so vigorously right now. same thing as last year. however, after reading much about doubles, i was very excited to try it myself. so i tried on a john deere, f-620 ztr 60". a pair of stock blades on each spindle, they are the only kind i have for the f-620. these blades must way five pounds each, at least. i was worried about the weight, but they turned fine. no noticeable difference, even in high grass. i mowed about 8 strips at 3.5" in about 6"grass, then mowed 8 with a deere hd-75, 54" w/b with a single set of gators. there was zero difference in the discharge. none. nada, el zippo. none. i want the magic effect of not having to double cut high grass i keep reading about. whats up with this? i don't want to spend a bunch of money on different blades for the double set up if i'm not going to get that 'magical' effect. i also have a few exmarks, will it DEFINITELY have the magical effect on one of those? on a laser 60", how about a turf tracer 60"?