They look like this.
We have to do a lot of gas sampling and these are really difficult to assemble. I've been scouring the internet for advice but there are none. Do you have experience with these? Have you found a good way to put them on that doesn't destroy hands, hearts, and dreams?
To clarify, the hard part is putting the blue stoppers in the tubes in the first place. Once they go thoroughly in, we can crimp them with our hand crimping tool. Since the time I posted this, I find a (little) better luck using a piece of cloth / putting the cap and the glass vial between a vice. With too much pressure, I actually broke a vial and glass shattered everywhere. The best way to put them in is with a twist, but that usually comes with an expense of bruised hands after extensive use.
Wish I had a camera on me, but they look somewhat like this: