Hello flybugpa, well if the whole reelseat came off, now is the perfect opportunity to choose another that suits your needs better, i.e. one that has a fighting butt option and that prolly will look better than putting a fighting butt on what you have since it apparently wasn't designed for one. I'm curious though, so i have to ask...there isn't a butt cap that was expoxied on at the end of the reel seat installation process? I've not seen many of those so i wonder if someone did such a good job that you aren't seeing the parting line just ahead of and between the butt cap and the barrel of the reel seat. Maybe take another look-see...if you discover there is a butt cap, life just got easier...otherwise, have fun selecting a newer prettier reel seat with fighting butt option. Hope this helps a bit.
Cheers,
MontanaMoose