I'll post photos later, I just did a search and came up with nothing! But I have a few Dominator heads at work I'll post photos of.
If you look at the tool kits he has on his web site you will see "Star" and Triangle shaped pieces in them. Those pieces are made of stainless steel or hardened steel of some kind. He mentions he now has plastic ones because the metal ones are MIND NUMBING loud. Anyway, these tools spin on an extended shaft die grinder like tool. You lightly place the spinning "star" against your metal and you can lift a low spot.
I found it to be "interesting" but like all PDR it would take a TON of time to really master. The biggest problem with it I mentioned in my first response today, do you make a much smaller one? They are way to big to be of help in the real world of PDR when you can insert a 1/4" shaft thru a hole to push a dent out.
Anyway, I'll post some photos tomorrow.