teacher
(teacher)
801
Either use your 18650 battery or buy you a 26650 battery and use your Cometa.
As long as the washer that comes with it is around the driver spring there is very little chance of anything going wrong.
I have several Cometas & they all work just fine. You’ll enjoy using yours. 
If you need further help with the “washer around the driver spring part”, or anything else concerning the Cometa; send me a PM & I’ll send you very simple but detailed instructions complete with pictures. :+1:
Welcome to BLF!! . 