Shimano Deore hubs with operating lube ports
Hubs are 20 years old. They have black caps/rings on the ends of the hub, each with two holes, and an "open" arrow (counter-clockwise, if I remember correctly). How is one supposed to open and close these? Special spanner tool? And use what to lube them (oil?) injected using what? I have a cute little Sharpie-size "ballpoint pen" oiler made by General that I found at McMaster-Carr.
Can't find any Shimano literature about them; I guess it's been too long! I like the old-style metal clips in the middle of the barrel that my Campy Record hubs have.