So I was making this very heavy oval washer and there are no oval
mandrels I could find this size. Somewhere between bezel and
bracelet size. Too heavy to try to pound freehand as it were and be
assured of perfect curvation. I laid a smooth round ring mandrel into
the groove of a grooved ring mandrel lining up size markings
accordingly, and slid the oval washer down both at once and malleted
it along the taper. Worked out nice.
Just put a dollar in my jar.