Don Jose, Permission granted. The coffee pot isn't in the wardroom though, we have a coffee mess in the after magazine ready room. That coffee will keep you awake on the mid watch, and if given a chance, it probably would worm a cow.
I've never seen a screw plug for powder, except the can that the powder comes in. I've seen shot pouches that have a screw in plug, that also doubles for a measure for shot, and I've seen them come with a spring loaded lever rather than threads to retain the same type of charger for shot. At one time I owned an antique powder horn from Sweden, and it had a hard to explain metal cover or plug, on the same principal of a teeter totter. It was spring loaded, and if you pushed down on the lever it raised the cover, release and the lid closed. All the rest of the horns I've dealt with had wood plugs, and I never have had a problem of the plug coming out when I was wearing it, but one time the plug came out of the horn when I put it in the truck, without me noticing, and spilled powder all over the place. As far as that goes, I've never seen a powder flask with a screw top either. They seem to mostly come with a spring loaded lever also. I've seen shot flasks that have adjustable measures that would pour directly into the barrel, but the powder charge should be measured in a separate measure from the horn for safety reasons.