this flashlight looks strikingly similiar to the one i am using to make a laser, in the one i bought, the switch was a multi-switch (if thats even a real name), it was an LED/laser pointer flashlight, normally you click once, LED lights, click again, lser pointer, click again, off.
so that may be your problem, i fixed mine by taking the switch from an old cd-rom drive (the open button), plus i wanted one that only came on when i held the button (and to make more room inside the flashlight)
your best bet is just swap out switches.
hope this was a help!!