[PeteVS]

This is for drums that are OUTSIDE the hub. When they were assembled, studs were pressed into the hubs. Then, the drum was dropped over the studs. The holes in the drum were countersunk and there was a shoulder on the studs sticking up above the face of the drum. Then, they pressed the shoulder down into the countersink, firmly "riveting" the drum to the hub. To get drums off, a 5/8" diameter hole saw will fit down over the stud and cut out the swaged portion of the stud. It will cut a square groove in the face of the drum where the countersink was and it will ruin the stud, but the stud will come out without ruining the hub. Others might recommend grinding the head of the stud off inside the drum. Either way should work.