Unfortunately, can't get these directly from Renzetti.com; they are only being sold through retailers. (All) Y'all are convincing me though.

One limitation I'd rather it didn't have is that you can't use stem extensions. Apparently, on other models, it's the top of the stem that is threaded that allows addition of extensions. Does the bottom of the stem for a pedestal mount come out so that it can be used in a vise? What length/type is your stem?