You don't think that folks would get the idea that if they just put the wedge in with "thumb pressure it will be easier to remove" like some do today? It doesn't take many shots with a loose wedge to render it pretty useless. I know back in the 80's when I shot my Walker a lot, it would chew up wedges so bad that I would have to use a hammer and a punch to drive it out. I bought a lllllllot of wedges back then!! Lol
I'm pretty positive that if I shot my revolvers with a loose wedge, metal would move immediately. ( In fact, I know it will. That's why I do what I do) I also know that bp is more forgiving than that "smokyless" powder. It definitely leads one to ramp up the "learning curve" quickly or you'll "fix" something with every trip to the range.
Interesting, what year was your grandfather's pistola made? I've worked on 2 that were both 1863 production and 2 that were conversions ( so 1872/73ish). They had arbors that fit.
Lastly, I don't know what Colt's method for fitting was. Likewise, I don't know exactly how Pietta does either. It may be purely modern machining techniques.
This is very true!
I've mentioned how I think it's entirely possible to make an open-top equivalent of the Ruger BH (or ROA if you like ) using today's materials !
Mike