Great light but........ if you carry it on your key chain.... from bumping around the the head eventually starts to unscrew downwards and falls off losing it somewhere in the street.
Mine fell off a week ago.
I own the stainless one and I owned the copper one until the head unscrewed and fell off.
The only way to have good retention of the head on the threads is to find/use a thick thread lubricant.
Great lights though, good milling unlike Jet Beam.
The light is cheaper on CountyComm's web site if you leave it in the cart for 24-72 hours you get a 10% off code and additionally you can use your points accrued from previous purchases.
W8lkinUSAI still have the stainless one which is on the spare key chain, .... I carried the copper one daily.
Can't tighten these down too much or the light comes on, can't keep them too loose either.
I used Jet Beams 'silicone grease' on the copper one which unfortunately may be good on a standard size light but too thin on these type of little lights/threads.
I really liked the copper one, won't purchase another.