I may have found the problem, some of the rockers have side to side play. My theory is the center piece is welded or attached to caps that roll across bearings when they turn(rock). The center piece isn't attached to the caps, which creates side play and they rock independent of the cap without involving the bearings. These two were installed in the rear, I haven't taken the front apart to see if has similar rockers. Here's a video to possibly show what I'm talking bout.
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