After your post I looked up Muecci pro shaft. The specs, {The Pro is a new high performance shaft that is now standard with all Pro-Series Cues 1 - 6 and is available for any other brand as well as other models of Meucci or BMC series cues. It has a thru to the tip, half inch HYDRAULIC ferrule}. What is a HYDRAULIC ferrule? The word "hydraulics" originates from the Greek word ὑδραυλικός (hydraulikos) which in turn originates from ὕδωρ (hydor, Greek for water) and αὐλός (aulos, meaning pipe). I do not understand what they are selling.