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FX Dreamline Classic loose h.s. screw

Call FX USA and order the jam nut they have that locks the adjusting nut in place. It's a special part, but they will know about it. I ordered one for my Royale, works great. Just check to see that you have some visible threads behind the adjusting nut for the jam nut. It's thin, but still needs a few threads. I would not use any type of thread locking agent on it. If you strip either the head or the threads on that nut, you have a problem.