Thank for all for the ideas.
I know about some special sockets for the twoeared spinners. But I wonder. In taught (hope it‘s the right word) the construction is:
give the ear a hit to fit or to undo. With a handy hammer.
A socket with a bigger tool is in my eyes a point of think about. But I‘m more with Mr. Chapman… keep it simple.
As my experience shows: copper and hide is wrong hammer, but as I noticed there are no lead hammers in Germany available.
I think it‘s about that lead isn‘t allowed in Germany for many things.
So I‘ll have the try with the nylon hammer. If there are some bad points (and dents again) I ask my neighbor for some pieces of wood.
Greets René