Maybe
Maybe try with a piece of copper pipe in some pvc pipe, would help you set up a jig for doing thisI have a back ground in competition model airplane construction. One year I decided to try polyurathane glue rather than epoxie to glue the balsa wood skins to styrofoam. The instructions said to dampen the surface to be glued. Well I applied an equivalent amount as the usual epoxy. The dampness set off the glue which expanded like foam spray insulation. It penetrated deep into the Styrofoam.
My thought is to glue the sleeve in with polyurathane, like Gorilla glue, mixed with some water and let it expand in the sleeve, trim the ends when dry. You would have a presision fit, that is extremely light weight.
You would have to experiment a bit, to get the propertions and mix right, how to center the barrel.
Anyway its a thought.
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