Clock oil
(obtained from a watch/clockmaker's supplier) on most parts.
Any ideas about sewing machine oil? I've got a supply of that, but I don't
think I've got anything thinner on hand until I'm up at the museum next...
It's probably OK. But you can get clock oil (in many different
thicknesses) from companies like H S Walsh. It's not _that_ expensive
either (or wasn't last time I bought some), you only use it a drop at a
time so a small bottle lasts a long time.
-tony