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The most important thing to watch when using parts made from aluminium with screw threads is to ensure that the thread is scrupiously clean before screwing together. Any grit or rough spots that are in the thread can quickly bite into the metal and gouge pieces of metal that will quickly cause terminal failure of the parts.
Other than that I use a thin smear of any light lubricant on the thread remember also that a lubricant will also tend to trap dirt and may end up worse than none at all.
Barry
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