I have a Tusk gas cap on my Clarke tank. Vent lines won't stay on it. Yesterday I lost it and I need to replace it with something secure. Any ideas? The spigot is recessed in the cap, so a hose clamp is out. I can't really get safety wire or a zip tie in there. I have tried a little adhesive; maybe I need to try a lot. Pic of a long-lost vent line on the Tusk cap.