Help - I have a 2008 Specialized Roubaix (carbon frame). I installed a small cylindrical electronic ID tag in the frame down the seat tube. The tag is slightly cone shaped and made to stay in place by friction. I must have inserted the cone the wrong way because it has slipped down and is now loose inside my frame just above the bottom bracket. Now there is a terrible rattle!

What can I do? My only idea is to inject some epoxy down the seat tube (or maybe through the water bottle cage threaded inserts).

Can anyone see a problem with this approach or have any other ideas? I'm desperate.

Thanks in advance for your input