The reason behind this strange request is that I’m currently attempting to build a rod in similar fashion. The jointed butt kid I have came with a ferrel that’s roughly 4 1/2 inches, that it says to glue a blank into. Though it sounds like it should be plenty strong, finding a mod-fast blank rated to 3-4oz that’s only 12mm in diameter, 7ft from the tip is not going to be easy. My idea is to skip the ferrel, modify a blank that’s the same diameter as the ferrel, and re-enforce the modified part of the blank with some carbon fiber mat and epoxy. Has anyone done this before that wouldn’t mind sharing the experience?