Ben, no there is no room for thread or even enough for them to rattle, they are just a perfect slip fit. I am always experimenting, so I have just left them float with a short bit of rubber tubing in at one end to make a compression fit, but if I decide to stay with one version, I will glue them in with Gorilla Glue(polyurethane). This is what I recommended to Jay Campbell for his buff hunt and he and his wife both used them to good advantage, they did use the GT Big Game 100+ as the outer shaft though. You can also fit an Easton Aluminum 1516 "Jazz" shaft inside, but it will be a bit looser, I don't have one here, but the OD should be .234.