I want to install a later model yblock distributor with a Pertronix III conversion in my 1956 292 Ford. It seems that the Cardone 30-2808 distributor is out of stock just about everywhere I looked, even at Cardone. Pictured above are 2 distributors. The top one is a C3TF-12127 which is a 1963-64 yblock distributor according to y-block.com and the other is a remanufactored Cardone 30-2808. I have the opportunity to buy the C3TF-12127. There appears to be a tapered metal shaft extension inserted into the bottom of the C3TF-12127 distributor about an inch below the gear. The Cardone 30-2808 does not have this extension. What is the purpose of the tapered metal extension and is it removable?