Re: Bearing Problems - Trying to identify/find parts
"brake cone" is the technical name for it.
running without the dust cap is fine, as long as you stay out of dirt and water, which pretty much means, you should get another dust cap.
try to find a real bike shop and they might have the parts. or, look at thrift stores, flea markets or craigslist for a junked wheel.
better yet, throw it away and buy a wheel from Worksman, or a wheel from bikepartsusa.com with 12g. spokes and a shimano hub...