Dan, I think that the usual material flow rules in the rotor may have been altered with the incorporation of the sweeps. The material in the seperator is now a very thin, very fast flowing mat due to the speed the that the sweeps are pushing material through. We only have small grains and harvest at, by some of your standards, low moisture levels of no more than 12.5%. I think this also alters the rules from harvesting crops such as corn. With a thin mat in the seperator, the bars can be shimmed out a lot closer to the cage than under the old set-up where a lot more material was in the separator at any one time. We have not used a built in cage bar but I installed a set of cage pegs after the first day and cut our rotor losses by at least another 2_3rds to very low levels, at least for barley. We have not stopped rotor losses completely but are close. With the pegs I checked for HP losses but could not detect any. I should add that we have the cage material over our separator grate. The grate, fixed on our machine, does not seem to be of any benefit and with the sweeps and a thin mat could even create a problem area to the fast flow of the material. There are other very big benefits to using the rotor sweeps which don't seem to be mentioned previously. Fuel consumption is well down as the engine governors just hold a steady RPM with little surging.. Driving is a soda as the variations in the crop and the driver's judgement of crop conditions are also smoothed out. The boost pressure gauge is dead easy to hold at a steady 25 lbs boost or continous full load, something I have always had problems doing previously. I also noticed much better feeding from the header to the elevators. Even with our best previous endeavours on rotor and cage mods, there must still have been some back-up of material in the cage which influenced smooth feeding way down at the header. last year we shimmed the bars in the last section next to the discharge with quite an improvement in capacity, so this year we went the whole hog. It certainly seems to work.Thanks to you and tbran and all the others who have contributed to these ideas. We now have a combine that on a tonnes per hour measured against the available engine HP may be amongst the best capacity rated machine of all combines. Cheers