Thanks for sharing that Old No.7, and welcome on your first post!
It isn't clear to me why the two shotgun cocking indicator pins would have such different lengths??? I wonder if the three pins or their retainers got mixed up at some point in the past, or if they were replaced with pins from another gun?
At any rate, they look pretty simple, and I think it would be a very simple lathe turning project to just make new pins of the correct dimensions rather than removing solder and building up with weld or brazing on extensions.
