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Lightchain said:
I have both the 1 CR 123a and the 2 CR 123a versions of this light - if you mean the S1703 and/or S1704. I had such a problem too. If you look inside the tailcap, there is a threaded aluminum retaining ring which holds the switch/spring assembly in place. Mine sometimes gets loose making the light flicker. This ring is actually the electrical contact between the switch assembly and the flashlight housing
With any pointed tool such as an awl, or a small snap-ring tool from an autoparts store if you have one (with 2 narrow prongs) you can easily rotate the ring to make it snug. But don't make it too tight because the switch doesn't like that either - I am not sure why. Anyway, that seems to do the trick.
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Yep, I have the s1705 and had a flicker, used a needle nose plier and gave the inside ring a slight rotation, took care of the flicker so far.