I received a Manker E01 open box item today, and it is immediately obvious why the item had been returned previously. The light works properly only in a very small rotation angle of the head, maybe 5-10 degrees. Any more tightening and the light shuts off or skips modes. When I first started looking at the light, i thought maybe the contact surfaces were dirty. I had another new light recently that just needed some cleaning and has worked flawlessly since. So I started to clean the positive contact on the PWA, and realized I was backing out the driver and emitter with my q-tip. Obviously this needs some work.
I also noticed that the body to head connection threading seems rather sparse. By that I mean in less than two body rotations I go from two separate pieces to light on, then 10 degrees more and the light does not work properly.
Of course I can just return the light (amazon), but if it seems like there is a simple way to fix it I would prefer to keep it. Advice on how to do so welcome.