I have a vintage Datejust with Jubilee. The stamped blades in the clasp are more straight than they should be and every time I try to bend them into place, the other gets so out of whack I have to get it back.

Is there an easy way to curve them correctly? Do some people use a mug or something as a template? Not the biggest deal int eh world, but just want it to sit better on my wrist and close securely.