Bill you are correct, I cannot stop all the rotor loss in a 52 or and other Gleaner rotor. Guess what, neither can any 'other color' you might try. But the proof is in the regrowth behind the combine. We put our fields up against anyone, any color any time. Also remember it is kind of expensive to 'try' another color. So far about half of the guys who ran Gleaners and tried 'other colors' have returned for a BUNCH of SERVICE reasons. It takes a big man to admit this as well. Add this to the fact we now have a factory hyped machine (which we are hype-hyping -hmmm this would be a XXHype) with the CDF cylinder Remember rotor loss on a Gleaner is very obvious, all 20-30' of header comes out one little 12" slot. looks worse that it is . Get out the old op man and see how many grains it takes per running foot to make a bushel loss. Also most loss in wheat comes from not shelling the grain out in the threshing grate but rather still threshing in the separator section. Run her clearance close, use one two or three concave filler strips and make sure the grate is level. It will work. Too many success stories to prove it. Again we cannot stop loss 100% but we will be better than competiton. We had a customer concerned over wheat loss so we went out and on the way looked at his neighbor's competition. The competitor was doing a great job. We went to where he was threshing and adjusted til he was satisfied. We then went to where his neighbor started in higher moisture straw , what a difference, what a mess. His concerns were melted away when comparing apples to apples. When hyping a Gleaner remember we always stress in green straw wheat one must run a separator grate retarding system, you can keep putting them in til the loss stops and the hp requirement will not increase. In RARE cases you can always stick A reverse bar in. No Elizebeth they do not have to be used in pairs. Good luck what ever you do.