Couldn't a small screw be installed behind the barrel lump and cut a shallow notch in the extractor rod for the screw to ride in and act as a stop?
Yes, you probably could make such an alteration. But then you'd be altering the originality of the gun and obliterating a piece of the Lefever puzzle. That's why I said the solution is to simply be careful to not lose the extractor. It has been just fine as it is for 120 years, so why mess with it now? This kind of variation is part of the charm and interest in collecting Lefevers. But it is also a reason why it can be very difficult to find a matching part sometimes when you are doing a repair or restoration.
