I am in process of hyperizing a n6, we didnt put in a threshing grate , where do put f2 rasp barIJ do you remove helical bars, or put them on top of helical barsIJ on our new concave the wires are 1 1_2 inches on center if we cut out everyother wire we will end up with a 1 5_8 gap is this rightIJ