I bought the cover plates from him. They work just like they claim. You don't have to put small wire in for wheat. Just use large wire with cover plates. I usually use all 3 cover plates, all large wire, then usually one or two keystock and the last one slotted grate. I also use them in soybeans when required. We are in the seed business and white caps aren't an issue with them. Remember though, when you cover the front of the rotor with cover plates, I believe it is important to make up for the lost area in the back with something like keystock grates, depending on conditions. Along with this setup, I have the gordon rotor bars which work great. Just bought airjet chaffer for beans and pleased with it. Going to get screens for corn, wheat and fescue. I am sure I will like them. Good luck