Join Date: May 2010
Location: Bucharest, Romania, Europe
Bikes: 1989 Krapf (with Dura-ace) road bike, 1973 Sputnik (made by XB3) road bike , 1961 Peugeot fixed gear, 2010 Trek 4400
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usually for the bottle cage it's just a threaded thing inserted into a hole (like a spoke nipple but larger), it can be glued in place with some epoxy or soldered or brazed. But for such a small thing epoxy works.
I've glued two regular nuts on a frame that didn't had holes for the bottle cage and stand fine for several years (i had stripped the paint for a good gluing though).
But if you have the holes and have the threaded nuts that fits in that holes, then almost any glue even superglue might work, but I'd recommend epoxy (two component like Bison Epoxy)