front drums w/o hubs?

I was looking at replacement front drums and the descriptions often read "drum only - no hub"...Uhm, I kinda always thought the front drum/hub was a single unit. So I guess I need to know how to take the hub uota the drum. Any help?:-k


1st. Remove the drum hub assemblies off the car and lay them down with the studs sticking up
2nd. Soak the mating surfaces including the studs holes with PB Blaster or similar and let them soak.
3rd. Take a good 2x4, place it over the hub end and hit it with a big hammer. If it doesn't come loose the first time soak it some more and repeat the 2x4 and hammer process.

I had one one time that wouldn't come off until I applied heat on it.