Once again I’m asking for your help. Bring to me my flashlight nerds! -A lightsaber nerd

So you guys really came through for me on this post. Apparently Convoy sells bright ass colored LED flashlights that should work great in a light saber as outlined in my previous post. I bought a red one per the recommended specs and I can't figure out how to get it to consistently work? I got it with the Vapecell 18350 in the pic. When I try to assemble the light I can't get it to work with the 18350. I could get the light to come on as I was screwing the flashlight components together but when I get them tightened down nothing? Like I said the light would power on momentarily when I was putting it together but it won't stay on? I've tried the battery in different orientations and the tube in different orientations as one side is bare threads and the other painted threads. I thought perhaps the battery charge was the issue so I tried a fully charged 18650 instead and got it to work for a bit but then it stopped working and I'm not sure what the issue is. I've tried the battery in other light sabers and it works, I've charged multiple 18650 batteries and nothing. I don't have an 18350 charger and just ordered one from Convoy as well as an additional blue flashlight because I'm sure this is an operator error issue. I just don't know what to do.

If anyone can give advice please help. I know nothing about flashlights so please keep that in mind. It was a little confusing getting this order together but 8 think once I figure it all out I'll be very happy. The short amount of time 8 got the light to work it looked very promising for what I need.