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wrote:

I just got my second rotary table... This one has a two position knob
that doesn't seem to do anything... Could anyone tell me what it's for
??? (see red arrow)

That knob is certainly to disengage the worm. You may just not know how to
use it correctly. One of mine has some weird deal where you rotate the
locking knob instead of pulling it in or out. - GWE