the rivets aren't needed, frequently already gone on these old rigs - drill them part way from the inside and drive them out, or sometimes you can slam the drum down on a hard surface and the hub will come loose
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics