I'm not riding much at present due the winter weather and I was out in the garage this afternoon looking for something to do. I've got an old Black & Decker drill I've had for ages hanging from a cabinet on a stand. I use it for grinding, de-rusting and polishing. So I took it apart. There's not a lot you can do except for removing dust & fibres (from polishing discs) and lubricate the few moving parts.
I use the drill a lot and I noticed that it was manufactured in 1986. 29 years of use - not bad going.
Ho hum - roll on spring.