stickstones
Vapor concierge
The Delrin adapters were made by Mestizo (I hope I got that right...I didn't look it up) and the ones that wrapped over the edge of the lid were my favorite...even though it was one of those that was too tight that stripped my threads. The one in your picture that I had was too loose and would fall off if a mouthpiece was put on it. We almost had Mestizo making those for us all, but like often happens. things changed and he was not going to be able to meet demand. It was never his intent, either, as he only made a few for fun. Turns out those are very expensive to make and I couldn't find a viable alternative.
I turned to Ed for help and he came up with the current design, before it was revealed to me that the nipple on the mouthpiece is a known weak spot. I was trying to avoid stress on the threads the whole time. So the current solution will work if it is kept on, but as @Mulehead has shown us, there are plenty of ways to skin this cat. If we can come up with a better solution that is affordable, I would be tickled pink to make it happen.
I turned to Ed for help and he came up with the current design, before it was revealed to me that the nipple on the mouthpiece is a known weak spot. I was trying to avoid stress on the threads the whole time. So the current solution will work if it is kept on, but as @Mulehead has shown us, there are plenty of ways to skin this cat. If we can come up with a better solution that is affordable, I would be tickled pink to make it happen.