I have been thinking about this for quite some time. I wanted to be certain before I cut more holes in the shell. What are peoples thoughts on this- adding a gasket to the inside of the mushroom vent dome so it seals tightly against the shell mounting bracket for travel and for draft protection in colder weather? I also like the idea of a nut/handle/threaded rod so that the vent can be opened and closed while inside the TD. I haven’t figured out how to bodge that together yet though…