So today on my walk home I came across a rear wheel. A 27" Mavic Module 4 rim laced to a campy rear hub. It was in a box of "take me" junk. Yes! The weird thing was that I wanted to build a coaster wheel for a townie and have been considering finding an old mavic rim to match the front rim on my bike (so weirdly coincidental).

Anyhow, two questions.

The nipples on the rims are rusty. I was considering cleaning off the rust and then painting the nipples to prevent them from rusting again. Is there any other solution?

Secondly, how do I identify the type of campy hub? It a low flange 36h freewheel (not cassette) hub. It's got the campy logo on the spindle but no other marking. It doesn't have a spring clip or grease hole on the axle. Also along the side of the threads, there are marking that note that it's BSC, 24tpi, English. What else can I look for to figure out what type of campy hub it is.

Thanks.