-My SAL NDI had dodgy scratchy threads (not fixable), the HKE's were fine.
I ordered from hkequipment on the 30th of march and still have not seen my light. No emails except for the one showing I won and they received payment. The scopeandlaser website had them for $68 and shipping but I did not find it until after I did a buy it now on ebay, and now I wish I had bought from them.
i wouldn't worry until its been a month....which is about how long mine took
I thought my NDI threads were stuffed too, but I made tool like a dentists pick and scoured the bottom of the threads in the head and it got the embedded grit out. After a clean and lube, it is now silky smooth.