Hey all do any of you own the Black metal power tube by trinity? I have one in my A-5 and it seems to work fine. So here is my problem for you to chew on. The little white plactic set screw in it, what does it do? I noticed that I may have had it screwed in a bit to far and my V-screw cut threads in it. How far should it be screwed in? I dont really see what it's function is. I work in a metal fad shop and we use poly-pro set screws lots and it usualy has a function that is plan to see. Little help and advice would be great. Thanks.