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The usual problem is that there generally isn't any mechanism for holding the table in alignment as it goes up and down. Often it's just the fit of the slot in the collar around the rack, and this allows for some side to side movement so it has to be tweaked every time you move it up or down to keep it aligned. And the rack is often only held in place by being clamped between the base and a collar, so it can turn around the shaft itself! Just not what they were designed for in most cases.