Remember you gotta load the batteries properly.
By twisting the spring to open it up load the battery then popping the whole thing back in the tube.
Sounds like the springs on the 18650 tubes have the same diameter as the 123 and 17670 tube springs. Interesting...
Oh Ken seeing your other posts, I'm gonna start worrying about your about 17670's tube's springs.
I hope you bought spares. I know I did I had to since they were only $2, and yes I am thinking what you're thinking.