Dan
Guest
I have seen one made in Canada that has twice the hammers of the old Gleaner ones and hammers are sharpened. The guy had run it one season and really liked it. Gleaner has a similiar one available now as option and it looks like chopper concave knifes are also sharpened. I imagine you have heard of the stationary concave knifes that Todd @ Clinton Ag. makes. I believe Todd uses JD row head knifes and I've heard of another guy that made up bracket to protrude them knifes threw cage on seperator side where the old pegs would stick threw on the P1's. He had to slice cage to stick them in far enough to just clear cylinder bars. He claimed that worked very well to slice the green soybean straw. He had an old N6 or N7 and didn't want to go threw the trouble and expense to install factory chopper. Sorry I guess I expanded a little on chopping. I'm not sure exactly what you mean by spiral chopper but the one I mention just replaces the chopper rotor that is currantly in machine.