also check the bearings that the pallet arms ride up and down on... kinda hard to describe, but in the center shaft area there's 6 bearings, 3 on top, 3 on the bottom. when the table is in the down position, make sure that all 3 bearings are tight (that is, if you try to roll them with your fingers, they don't roll), then table up and check the 3 lower bearings.
if any of them are loose, you'll definitely have problems.