I have heard that the neils concaves are good, but I had no idea who made them. We had a contractor who use to work with us before he retired that fitted one to his old New Holland TX34 he had at the time and he was very impressed with the improvement it made to that. How big a saga is it to get the old one out and the new one in and level againIJ Do the JD concave inserts go into the loewen concave the sameIJ How would the loewen concave compare to the Gen 2 concaves in the later deere'sIJ