during reassembly, be sure to clean the gears (all that you can get at anyway) of any old, dried up lubricant if you see any. The worm gear and main gear drive are usually lubricated with a pure parafin grease, those I suppose a light lithium grease might also suffice. I use a grease designed for lubricating clocks, speedos, etc. Just a little dab but make sure it gets into the teeth - don't want to run these things dry as they wear faster that way. You want to use a grease (so it stays on there) instead of an oil (which will not).