Had problems with my 135 a while back. I replaced the auger that goes from mill to tank and it's better, but still blows out a lot of dust out the top. There's a rubber flap that hangs down from the top of the auger trough that's kind of shredded, the auger has a gap in the flighting where this flap is. You suppose I need to replace the flap. The three bolts in the pic are where the flap is.