@Skunkport Did you say you bought some of these? What are they? Do you have reason to think a VC will fit in them?
Or are you thinking of using them as stems?
I missed this somehow! No I didn't buy one, they're $50, that's a 2mm thick titanium tube. I believe a vapcap will fit inside one, but the ends are open so it's no good as a stash, it turns out they're actually pepper spray containers! So the brass end is a button which presses on a canister inside, and it shoots out of a hole at the other end.
I was actually hoping to use them as stems, but I can't work titanium myself and stardustsailor doesn't think they'll work - if it's only 2mm thick at the ends as well, that wouldn't be enough depth for the vapcap tip to fit securely in.
I do like the look and I want a cigar style stem, but I'm on Phatpiggies waiting list to get on his next waiting list and stardustsailor has started to make some thicker stems too so I've shelved the idea for now.