Shadow TC6 neutral white 4C XM-L! 2 x 18650, should be regulated.

LED Flashlights – General Info 18650 Flashlights
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Your pics are great - what are you worried about?

It appears that the ET light's first thread has been a bit mangled, and there appears to be some debris in the thread valleys.

A good cleanup and inspection of all threaded areas may reveal some hidden damage.