Constructive comments lead to new ideas, one of the many things I love about this Forum. In my previous post here, @Rangie asked 'what provision is there to seal the lipsticks/feed tube during transport?'. The basic answer was none - other than the thimble afterthought. Then @Ian reminded me that the Monitor Picnic has a 'snuffer' transport cap, which threads onto the lipstick. So now I wanted to make a threaded lipstick. I have two spare Svea 123 burner bells with threaded collars, and so I decided to make a new lipstick with the same thread pitch down the outside. This thread has a 1mm pitch as best I can measure it. This time I decided to put a 0.23mm nipple into the lipstick rather than drill a small hole. Below on the right is the new lipstick and Svea burner bell and on the right is the original lipstick and the Primus burner bell So now I need a snuffer to match the new threaded lipstick. A piece of copper pipe with a soldered cap makes the snuffer, and a plastic liner glued inside made for a tight fit. Since the snuffer is not under any pressure when in use I used the lipstick as a tap to cut a matching thread into the plastic liner, and put a blue plastic stopper inside the cap, Much better than the thimble IMHO. Thanks again to Rangie and Ian for the helpful comments.