We have had quite a large number of operators install airfoil chaffers in 9K series combines, and they have been very successful in all crops. These are built by Will Mfg. of Denison, Ks. (785) 935-2304 email gwill@holtonks.net
Your nearest dealer_distributor for air foils in ND would be Westward Products of Jamestown, they could tell you at which of their dealers in ND you could pick one up. I believe they also sell the risers.
