Basic Routine Cleaning and Lubrication of your Flex Shaft System:
The shaft should be checked, wiped clean, and re-lubricated with grease every 50 hours of use. With every 200 hours of use, the shaft should be thoroughly cleaned with solvent and lubricated.
Use a grease specifically made for the flex shaft system or a high quality white lubricating grease.
First and foremost, make sure the unit is unplugged.