How to remove drums with out destroying them???

Dont bother cutting the swedge, just grind the heads off the backside of the hub down to the OD of the shank and tap out with a punch. The swedge is fatter than the shank on the threaded side and if you muscle that out the back, you burnish the id of the hub out to the size of the swedge, ..ruined unless you use an oversized knurl press in stud and that still is sketchy.