[Peanutbutter]

In post #7, you lost me, not sure what you are referring to as the stud with the squire drive top. I'm not sure what the fitting on the front of the knuckle is that has the 1 inch or bigger hole in it, the one close to the backing plate. Posting some pics of the knucks on my 66 Napco C80 to give you a better idea of whats inside, the knucks are identical on my 63 B model.