*Brian, I'm not sure but I think I know what tool you're describing. My '54 that I got in the late '70's came with tool that you describe made by the owner of the truck from a hacksaw blade.
He ground down the outside edges of the blade to fit in the hole in the side of the distributor then started filing with a small file to shape the inside shape of the blade to go over the threaded stud and each side of the end of the blade would go into the slots of the nut, if this is what you're talkin' about.
This is about as clear as mud, huh? e-mail me and I'll send you a drawing of what I remember the tool looking like, if it's what you're referring to.
Jacques
