N6 cage diameter

I got a kit from NDDan used large thick flat washers and serrated flange lock nuts to bolt through the cage. I have 4 seasons on them and haven't had trouble with them loosening off. I believe the channel helicals were out of an R62. I got a kit with steep pitch over thresher and standard over separator side. If I was to ever do it again I would go steep pitch all the way. I was also able to ditch my cage sweep since using the channel helicals.

I am learning I almost think the faster the crop moves through the rotor/cage the better. It keeps the crop mat thin and the seeds can separate easier. If you generally have tough straw conditions I don't think you want any reverse bars. If your straw is generally dry and breaks up easy you could get away with them. You would likely get more shoe load though. I put an f2 bar right in the bottom of the belly of the cage when I put in the channel helicals and I've never run without it. I think if you felt the crop mat was moving too fast there's enough room to install two of them to restrict flow. I get a bit of build up of straw on the top of the cage and on the right hand side upper rear of the cage in wheat. I also install covers across the section of cage above the concave otherwise I get straw build up around cage. We grow barley, lentils, and canola also and I get no build up at all from those crops.