Question:How To Size/install gimballs ?

[backbeach]

I'm retrofitting 2 rods I wrapped years ago with plain butt caps to use in rod riggers. The blanks are black Lami glass #BT857 s and #BT963m. I'd like to install aluminum gimballs. I assume I size to fit over and shim with tape and then use slow cure epoxy, is that correct. Can I use a 7/8" for the 963m and 857s or do I need a 1" gimball? Anything else I should know- besides lining up the notches the way they need to be? Thanks, Jim