Castle AT-8 Diagnostics Manual - Manual (Page 10)

3. Locate the bearings attached to the upper bracket that ride on the top of the beam. Tighten the bolt
head on one side of the bearing while holding the nut on the other side of the bearing.
4. It is important that these be tightened down firmly.
5. After tightening the bearing nut on the front of the upper bracket, the nut on the rear of the upper
bracket should be tightened next.
6. Do this by holding the nut closest to, and in front of the bracket, while tightening the nut at the rear
of the bracket.
7. If the bearings were loose, the tightening procedure could change the arm positioning. Test the
positioning of the arm by rolling it along the beam. It should roll smoothly the whole way and be
parallel to the tabletop.
8. Adjust arm positioning by running procedure 8.21. This step especially needs to be run if the
bearings were quite loose and the arm doesn't move smoothly after tightening the bearings