I don't mean to harp on you, but for the benefit of anyone else reading this... WD-40 is
not a lubricant, it is a water displacer.
Quote:
While its uses are many and varied, WD-40 should not be used as a general-purpose lubricant, as it dries out very quickly and collects dust. This can result in serious damage to machinery and equipment designed for use with heavy oils when they are lubricated with lightweight WD-40.
To answer your question, it was already mentioned in the first reply, but I would say you could also use white lithium grease. 
