Thanks for the input & the video. I’ve also found a pretty good video on YouTube that takes you through the entire disassembly process. Looked like it might be within my skill set. Now all I need to do is set aside some time to give it a try.
Does anyone know of someone who can work on the internal mechanism of these derringers? I have one with a good hinge, but the firing pin does not advance to shoot the 2nd round.