We were brought an 8ft cast bronze crane in a very sorry state. It was missing it's lower mandible which we were to replace. We looked at forging it but getting a small piece of silica bronze of the right size was too tricky.
In the end I whittled a wooden beak out of hardwood and cast it in an open faced green sand mould, and fettled it to its final shape. Some light TIG welding with bronze filler rod and a couple of coats of toumaline patinated the new to match the old.