That drill is bada$$ ! Anybody else notice how these old drills look like assault weapons and ray-guns.......while the new stuff looks like multi-colored tennis shoes?
Anywho.....I've found "zero" formal sources for info on rebuilding these. It's actually a very small market for each individual tool, even smaller when you get down into the different brands. The plus side is that these old tools were actually meant to be taken apart and serviced - you often have to disassemble the tool to change the brushes, for example. Another plus is the fact that they are all metal and can be refurbished. If the parts are there and are the correct dimensions, you can make it work.
I use a tube of lithium grease I got from Wholesale tool, which, for my intermittent use, works fine.....YMMV. These old guys run great on it:
