aznsx
Flashlight Enthusiast
One last check - make sure the high/low switch is not loose, it needs to be fully tightened.
Thread slop certainly can be a factor and must be considered to the degree that it exists.
That aside though, in my opinion, and based on my limited experience, that "tightened" above should be emphasized even further. This design is not 'optimal' (which, in fairness, is often the case in the real world), but I think it can be made to function reliably; however that is dependent on the application of more torque when tightening the H/L ring in the head than I initially thought - quite a bit more. I found I had no tool handy that I could comfortably do it with, so I bought the Malkoff bespoke 'spanner' to use. Yes, I know it's somewhat expensive, but high quality tools usually are by their nature. I may only use it occasionally, but it's paid for itself. Note there's a hole through the body of the wrench to implement a 'T handle' of sorts. I just hand tighten with my hand set to 'max' torque wearing a nitrile-coated glove and that does it, but the point is that hole is there for a good reason. That ring must be VERY snug to have things function reliably. After properly torquing mine, it has functioned reliably. I'll see if that holds true with further use.