Surfstix let's do it I will pm you. Sold pending payment.
This was was something I have yet to find out and someone needs to try. At some point in production they started using the ribbed top piece on the drag pack. Now if the plastic lower piece to the drag knob off the x series fits the older ones you could have a clickable knob...drag curve would still be the same due to the different in thread size on the spool shaft...someone out there has to have two of the same size vs one x series one not