You're right, Jon, there is nothing for that. Sorry, I thought I had seen it there. I must have remembered seeing the tool for a vent-rib. My idea for that was to use the firing pin on the one end and the existing bead on the other and using a punch or scribe to make a mark somewhere in between. I guess that won't work if you have already taken of the end of the barrel with the bead on it. Hmmm. Will have to give that some thought.