What's the diameter at the end of the butt? And what's the shaft weight so I can calculate the butt weights?

Actually there is no such thing as a carbon fiber plate when you have a ferrule, it's a pad, could be carbon, could be fiber, could be another material, but not a plate. I don't see anywhere where dendweller agreed you have a carbon fiber plate. You keep confusing words although I think you have a better understanding than before now.
As to your other question, if the carbon fiber pad wasn't damaged I would see no reason to remove it, you may end up cutting a couple thousandths into it when cutting the tip off but that would be it. If it was damaged and he felt it needed to be removed, he should have put a new one on before putting the tip on. Listening to you describe things, if I were the repair person, the only thing I would have asked you was what tip you wanted.

Bob Jewett said:

Some of the worst advice I've ever seen for a pool shot was by a team captain during a time-out. Absolutely clueless. The notion that the typical league player is going to learn anything useful during actual matches from their fellow players is questionable at best.

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It depends on the captain for sure.

my first " real cue" was a red leaf dufferin two piece circa 1990...

I bought a house that came with a pool table with 4 red leaf dufferin one piece cues circa 1985...

Bump for beautiful fancy player!