Roadworx Thread Adapter 1

the threads on these things are often a little gnarly. about half of the ones i got have to be tightened with tools after the first two turns.

I suggest you try to use the right thread in the first place if at all possible. making a 1/4" a 3/8" like this doesn't make it more stable.

But it works and sometimes there's no other option. Good to have a couple of these lying around. and for this price, just chuck one in every corner of your studio, a couple in every bag/backpack you have, etc, along with all the other spigots and adapters you have.
What, you're already looking at these things, so you're the type to do that.