Gift arrived but no o-ring. HELP!

[ruriimasu]

Hi guys,
I bought an ultrafire A1 as a gift for a friend but it doesnt have oring at the lens. Is there anyway i can add 1 in myself? and if i can, can anyone tell me how to open it up? or suggest a way to waterproof the front? thx

 

[LukeA]

It depends on the light as to whether you can add an o-ring or not.

 

[ruriimasu]

i think can. i can move the lens around with my finger its just that i have no idea how to open up the head as it is one piece and the only way seems to be through the bottom of the head (the LED base or whatever that is) but it seems to be stuck.