I’ve heard from guys I respect that they don’t even like repairing integral striker tumblers on run of the mill English boxlocks. I also saw a repair that featured a threaded bolt peened into place and ground to fit the hapless boxlock that suffered the problem. It worked.
But, it was ugly as a manure fence in a hailstorm.
Stephen, my email is in my profile here. Just click on my name and it brings you to it. I think we last spoke about Oldsmobile service manuals you had no need for, but, wanted to go to a good home. Sadly, although I wanted to help, I simply didn’t know anyone who needed books of that vintage.
Best,
Ted