How do you remove the clean grain elevator from a 2188? Does it go out the top? Also my concaves need replaced. They are the large wire the front has all the wires in the middle front section has all the wires in the middle back section has every other wire removed and the back concave has every other wire removed. I have the keystock grates as well. I harvest mainly corn and soybeans. Is this the best set up? I bought the combine used and this is the way it was.