As the title says, I'm having issues with my surefire it's been working perfectly for years and now all of sudden I can't get it to turn on. Everytime I push on the switch it seems to just momentarally turn on and then off. Every now and then it turns on but not for long. I've taken apart the entire swtich and cleaned everything(Noticed everything was silver or silver platted Very Cool). I guess my next step would be to attempt to take the head apart is there anything else I could check before I do this?