The butt plug threads looked fine. There is a thin fault in the left butt plug - see the whitish area but it is not a "load bearing" area. I think the butt plugs look amazingly fine for a 170 year old gun:
By the way Greg, another New Zealand on-line acquaintance called Robert Hollimore up in Rutora...I've passed the phone number to David Trevallion.
That's good I could help.
Robert is probably our last English trained gunsmith, and he is basically retired so I don't know what we will do now.
The way things are going here I suspect sending guns to the UK for repair will be out of the question too, they wont let them back in!
Interesting about the threads, perhaps they are so tightly fitted fouling simply cannot get in and cause corrosion.
I would love to take mine out but am too afraid of causing damage, and it probably wouldn't tell me anything anyhow.