I have been reading your posts on balancing the straw chopper on your combine. I'm sorry to say I have know experience with the Gleaner chopper, but I have had experience with a Massey 860. The Massey 860 had a large tube that the flanges that hold the knifes on is either 3" or maybe 4", is the Gleaner built that wayIJ If it is the problem might be dirt inside the tube, as that is what I found to be the problem with the Massey. I know it's hard to believe, but after weighing every blade on a gram scale and the thing still tried to tear the back end off, I decided to pull the shaft out to check and or change the bearings. After I got it tore down, I realized the shaft had a hole in each end and I accidently realized it was full of dirt and chaff, so I took an air hose and blew all of the dirt out and stuck corks in the holes, and guess whatIJ It ran like a swiss watch! If this can be of any help, it was just a thought and my experience, and my .02 Dale Walker SCMI.