Thanks so much and I’ll be looking for your answer 
I think that the UI of the TO10R shoulb be like the TO46R, and made that statement on my review comments and sent it to Jelina. Let’s see if they change it on next batches or in future lights!
Yup, same question here! That body could be different internally to take a 18350. I though about drilling mine in order to enlarge the inner diameter to fit a 18350, but I’m afraid it may damage the tube, so I’ll keep on using the 16340.
I guess that the 16340s are still more recognizable due to the CR123A batteries. I don’t know if th 18350s have equivalents in non rechargeable cells… Maybe that’s one reason… 