I'm about to grab a sentinel m16 clone from FT. The $11 one has aluminum threads. I keep hearing horror stories! Im going to use a vivi which I do dry burn about every 2 weeks(waiting on new heads). People keep saying there threads strip after switching tanks. Anyone else have a positive exp and might want to change my mind about ordering. I'm dying to get a mech but I don't want to shell out money for a Ferrari type mod!