[SuperB70]

You can make them by using two different size dimples and sheet of rubber.

Use bigger dimple die at bottom and a sheet of rubber above that, then sheetmetal and smaller dimple at the top. To get best result you could strech the sheet first with english wheel just that small area where are you gonna press.

I just tryed myself, used 1 1/4" bottom, 3/8 rubber ,20 gauge steel and 1" at the top. Its working pretty well even with out streching. Got a 1/4" deep but that would it even easier if I had wheel'd first.