Background: Delta 36-444 CS, less than two years old. Light to moderate use, usually w/stock 5/4 or less. Machined pulleys, link belt and used to easily pass the "penny test". Running a WWII, 1/8" kerf blade. Recently noticed a significant vibration, particularly on the right table extension. Checked for loose bolts and I think that's all OK. Felt the motor while running and can't feel any significant vibration at that end. Pulled off the belt and blade and started tugging on the arbor. The "up/down" play doesn't feel to exist at all. However, I do feel a tiny bit of play going "in/out" from the arbor (arbor/pulley). My Delta manual (bought the unit as a store demo) may not be complete, as there is no parts breakdown. Anyone run into this before on this flavor saw? Suggestions? The cuts appear to be holding very true, but it's bugging the bajeebers outta' me and I figure it will just get worse if I don't give it some TLC. Thanks.