I've had great results with 5 minute epoxy. I get the best adhesive coverage by first coating the inside surface of the hole with epoxy using the plastic handle of a cheap decorative paint brush (I can wipe it off with a paper towel and reuse it over and over). I then put a goodly portion of epoxy coating the brass tube and rotate it with in-out plunger motions as I insert it into the hole.
I initially push the tube in so it is flush with the opposite side and then scrape off the excess epoxy from the far end. I then push the tube back flush with the near side and scrape off the excess from the near end. Finally I center the brass tube where I want it. Off course you need to plug both ends of the tube with dental wax to prevent difficult epoxy cleanups after it's hardened.
I now only use Gorilla glue when the hole is somewhat over-sized compared to the brass tube, since it expands so much. I used to use it more, but find I like the epoxy better now.
Also, sharp tools are critical as is a light touch when you get toward the end. After all, there is only about 1 mm of material covering the tube near the end.
