Search:

Better view.
http://i22.photobucket.com/albums/b328/spindlecone/peen002.jpg

Thank you the spoon idea was not mine,has been talked about by many.
but seeing how well a spoon actually works (with a far greater radius)made me make a peening hammer with about the same curvature...

You can use a table spoon if need be,Only real effect loose scales create is a bad feel when stropping to me.