Williamson Derringer BP adapter

[bear tooth billy]

I recently purchased a Williamson derringer in 41 rimfire. They also came with an adapter
that it could shoot cap and ball. Like most, mine is missing after nearly 150 years. There were
aftermarket replacements made, sold by Dixie gun works back in the 60's. Does anyone have one
of these or has made one. Only about 10'000 were made from 1866-1870.

                               Thanks  BTB