For the gear tooth’s you need some kind of grease type lubricant . Check the Microtools.com , they have a number of lubricants for the cameras, but this lubricants expensive. I think you can try a little bit of technical Vaseline or white lithium grease from the automotive stores. You need just a little bit on the toothed part of the gears. The old oils and greases can be removed with lighter fluid and a small brash.