Service is great, the shipping
Service is great, the shipping process is fast, and the price is reasonable. The product is precisely manufactured.
I want to add one note that I did read the installation note before actually installing it, I can't speak for any one, but in my case, with an O-ring underneath the clip, I cannot ignite the light without tightening the tailcap, which resulting the O-ring to be squeezed out inevitably.
And without the O-ring, the gap seems OK for me, it can still rotate by applying some gentle force, and it has some friction to prevent it from rotating freely.