That would get my attention as well.
A few posts back is a picture of my bottle, it's a bottle for a Reo. The hole in the cap I had to make, smaller than for Reo I believe. Using Fatdaddy BF tube but shortened a bit. The metal tube doesn't slide into the plastic tube very far, not past the cap. I have no leakage. This is something easy to do with the only modifications made to the metal tube (shortened) and to the bottle. I find it easier to refill than my Reo Grand, about the same time but cleaner. Sorry it's a clone but only the body. I accidentally fired it when changing the bottle. I left out the part where I screwed the cap off and back on, no need to show that. I do use a letter opener to pop the bottle loose, might make the squonk hole a fuzz higher to get a thumb nail in there.