The V2 Tilemahos has a two-piece center post pin that replaces the one-piece center post pin from V1 to provide for center pin adjustability. Imeo has named the two parts the steady pin, which is the half of the pin screwed down to the cup that doesn't move, and the AD pin, which is the adjustable part that screws in and out to make connection with mods that don't have adjustable center pins of their own.
BTW, if you are talking about getting the hybrid base for Esterigon, you don't need an adjustable center post pin. The solid pin that comes with the hybrid base is already made the correct length, and the solid one-piece construction has better conductivity.
THANX ALOT Random for sorting that out for me - I guess I will wait for the availability of the hybrid base for my V1 Tilemahos ...