[DanEC]

I was worried about damaging the chrome KO spinners on my 66 Vette and experimented with boards, heavy leather, shot filled hammers, etc to protect them. Quickly learned this is not a good idea when I noticed one of them had started to back off and splintering wood was becoming hazardous to me, the wheel and the fiberglass. I've used nothing but a good quality lead Muther Thumper ever since and never noticed a mark on my chrome spinners or my ERA's aluminum spinners and I hammer them on pretty firmly. It's my own opinion that anything but a lead hammer directly on the KO spinner is not a good idea. Opinions may vary but not mine.