Hey. Everyone.
I found easy solution. As member WarriorOfLight suggested, I contacted Surefire. Actually I visited their cooperation office at Fountain Valley, since I also live Orange county CA. What a experience I had. Customer Service Rep listened and asked if I brought light. I said no. He said ok, went back inside, 1 minute after he was holding z51 kit set, and said this is your. No charge no question asked further. Amazing. It is same experience with Craftsman hand tools no question ask exchange policy. That is what Made in America,Lifetime guaranty works.