My LS-30's are squeaky, but they move fine. Looking down into the pivot area I see plastic/nylon/whatever, so I'm not sure what kind of lubrication (if any) should be used. Since LS-30's are not easily disassembled to a degree that would allow you to clean out that pivot area, I'm thinking that any wet lubrication (oil or grease) might do more harm than good in the long run, once it got dirty.
Should they be left dry or should they be lubricated? If lubricated, what should be used for lubrication?