Greg: Thanks for the recommendation. Here's a short explanation of the difference in threshing cages. When AGCO originally devised these machines, the cage used a 1" opening for separation. Problem was that with the helical mount arrangement and the opening size they would see more rotor loss than anyone wanted in larger crops--however, in wheat and milo good separation was still there. In order to help these losses, they then began using a cage with 1 1_4" tall by 1" wide openings. This helped the losses, but the taller opening also allowed more trash thru to the accelerator rolls, wearing them much more quickly and trashing the shoe more. These openings are in a straight line checkerboard pattern. About 10 or so years ago, we began to rework cages using a pattern which is staggered--that is the holes are offset 1_2 space instead of being in a staight line. This allows us to use smaller helical mounts for more open space. We also find more agitation off the cage surface for separation. This allows us to use the 1" square opening to hold trash inside the cage while maintaining separation. It's also the strongest of the 3 versions presently existing. There's a little more to this, but these are pretty much the basics. Hope this answers some questions. We have also developed a fully enclosed cylinder for these combines which uses either P3 or P1 processor bars, or a combo of both, and it's working out very well. Feel free to email with any questions or requests for info.