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@rhowe
My dealextreme ultrafire U4-MCU cree torch kept cutting out on me. It got worse the more I tried tightening it up. Took me a while to work it out, but the brass LED housing was loose. It screws into the reflector block and needs to be a tight fit to make electrical contact.
Once I realised you could remove it, I did and gave it a good clean. Put it back together and I can see in the dark now!