I am the Massey guy who has a friend with two r72's and we and we go through my 8780xp Massey and his machines in my shop.Last year we put in the kit that drops the floor and takes out the hump.We put it on one machine to try it.He has cut two days and the one with the kit is going 1 to 2 miles per hour FASTER.Next year we will do the other machine.Thanks to Dan in north Dakota. I can't remeber what the kit is called but I know it works.