How to dismantle Niwalker Vostro BK-FA02

Hello i bought a Niwalker Vostro BK-FA02 a while back and the ring that you turn to make the light come on has a problem. The positive stops, or the little click at each power level has ceased to function, so the ring just turns freely and it switches itself on in my bag really easily. Really annoying.
I called the company i bought it from and they said it would have to go back to the manufacturer (China) so forget that, i really need a torch where i live so cannot really do without it.
Has anyone got any idea how i can get this thing apart so i can get at the innards of the ring and possibly fix it.

I would be very grateful for any help. Thanks.

I don't know how to take it apart, but to stop accidental activation in your bag, simply lock it out by slightly unscrewing the head.

You might ask Vinh those questions about your light. He modified a bunch of them over several years. I'm sure he had to have taken them apart enough to know the insides pretty well. Go the modders section and you can find him there.

Ok thank you for your help.