Hello Brownbaker, first, I assume you are trying to remove the spinner in the correct direction? They are "handed" so look at the direction shown on the spinner.
I always use a Thorex 716 hammer with replacable "plastic" striking faces ( approx £15.00 in Machine Mart ) the copper one in the tool kit can damage the chrome.
Couldn't one use of those hammers with copper on one side and hide/leather on the other?
I realise those hammers are more expensive than the Machine Mart version, but you wouldn't need to have replaceable striking surfaces.
Edit: Come to think of it, couldn't one sew some leather "socks" for the spinner (connected by leather or a piece of string so they don't fall off while hammering) and then hammer with just about any hammer or even a rock.
