HELP - Cragar SS Lug Nut Washers Keep Crushing - Need Alternatives!

When I had my Cragars I had a machinist friend make these washers. We used 17-4PH stainless. It is very hard and very strong. You will most likely have to supply him the 1" diameter 17-4 material. As I recall, McMaster had the bar stock. I think it took around 10" of material to make the 20 washers and a few extras. (sorry for the distorted picture!)

washer1.jpg