This may not apply to the subject covered in the above posts but it shows what goes on in the industry.
Many moons ago I was working as a consultant developing overhaul and repair procedures for helicopter servo systems. This company located in Burbank, California also overhauled other aircraft appliances including electric fuel pumps. When they got ready to assemble the fuel pumps they lubricated the bearings with WD-40 © which is not a lubricant although a lot of people think so. WD-40 is a water dispersant. That is what the WD means.
