Thanks Gents for posting. I've sent a request to the Lithgowicon museum, but haven't heard back. While I understand that he could take the dimensions off the take-off barrel I supplied, my concern is that if he uses one barrel, well ... you have the dimensions from one barrel. I've no idea how close the barrel is to the factory spec, hence my interest in getting drawings over to him. At least then, the barrel is almost "new old stock", so to speak.