We're in the middle of replacing the concave and rasp bars in our 7720 Titan II for the first time since we've had it. We're using a new Loewen concave and chrome bars purchased through A&I. My question is, with the new bars and concave installed, the bars WILL strike the concave if the adjuster is tightened up too much. I see no way to adjust a "stop" on the concave adjuster to prevent this and the owner's manaul does seem to suggest that there is no stop to prevent the rasp bars from striking the concave. I was curious as to whether this is the way it is with everyone else's 20 series machines or not. I do not recall ever being able to adjust the concave tight enough to hit the bars with the old concave and bars before this. Thanks guys!