[Dobie Gillis]

If you need to replace the hub or drum, they are held together by the press fit of the wheel studs. To separate, drive the studs out from the front.

To reassemble, you should press the studs back in with a press, but many people use a hammer or pull the studs in with a spacer and a lug nut.

Personally I would avoid hammering the new studs in, too much opportunity to warp or even crack the hub or drum. I prefer to use the spacer and lug nut method or have a machine shop press the studs in if you don't have a press.

You should have the drums checked for true after installing the studs. If they're out of round have them surfaced just enough to make them round.