Trying to replicate the look of factory locking washers used on vintage razors. (and modern razors for that matter). Current I simply just dome the washer and peen away. They look fine, but the factory washers definitely look different on most vintage razors. The factory washers have more of a pronounced shoulder instead of a half sphere look and the finish pinning looks like it's almost counter sunk into the washer. Anyone know of a technique or trick to get that look?