Kerry, there are a few questions I have for which I can find no answers on either your site or the Feisol site.
First of all, can you explain what the leveling base is and how it works? It utterly eludes me. Does it go into a center column mount? Does it have some sort of release and lock mechanism? Is this something you put under the tripod head that allows you to level below the head? All I can see is that it has a knurled shaft and a level on the side other than that, it's a mystery to me.