Yes. Rivnuts work somewhat like pop rivets. The installation tool has a threaded mandrel that the Rivnut is threaded onto. Once the Rivnut is inserted and compressed, the part of the Rivnut on the "back" side of the hole flares to lock it in place. Then, the mandrel is unthreaded from the installed Rivnut. Unlike pop rivets, the OD of the Rivnut typically does not expand to fill the hole. If it did, the threaded ID would also grow, which would make for very loose threads. This is why the hole needs to be drilled accurately. In a former career, I used quite a lot of Rivnuts on steel sheetmetal work. The best we could achieve was about a 90% success rate of having them installed without spinning in the hole. Odds on a round-section bike tube may be higher, as the shape of the tube might act as a key to keep them from working loose. The epoxy idea might help there, as well.