I run a specialty rotor with 6 straight bars for corn. They run very clean even in wet conditions. I use them in soys and edibles to reduce splits and cracked seed coats. It will give me the quality of a bean combine without having to buy one. No straight bars in beans. They also reduce power consumption greatly. I purchased them from Harvest Services ltd. from western Canada. I think they were in Manatoba. I would never use large wire concaves again.