I personally think there is some merit in the posting above about toggle linkage slack due to wear or previous harder than normal use(abbynornal hot loads, long headspace, misfitted/worn parts).
We all know what inappropriate headspace/gapspace can do for the brass cartridge itself, extractor, and/or the firing pin capture in the breechblock.
I too have a Luger toggle that features a replaced pin between the breechblock and the middle link. You can tell it is way oversized. Not sure how it was done by those unknown to me, but strongly suspect that a special jig and carbide reamer were used to fit the new pin into the newly reamed holes in the two parts.
One would think that slack in a train would increase the forces on said interconnections, kinda like getting a run at it versus a start up push; kinda a crude rendition but helps me try to come to grips with such.
On occasion I have had a rifle barrel that would not budge with my 250lbs at 3 feet, and my feet off the ground and me moving. A sharp blow with a hammer on the wrench pulled it off in one blow. Kinda like the air impacts you see wheels being mounted. So one could imagine an analogy to the blow being applied to the toggle train with loose fittings between the links.
Seems like, my opinion only, that the fix of just replacing a pin in an oversized or ovalized hole will not last long. I know people do it all the time, but guess I would not choose not to do that. One could imagine the reaming routine being kinda like tightening up double shotguns, both parts are reamed in place to a precisely fitted pin.
Just pure opinion from a casual reserver. I am sure the real experts have their own opinions and rightfully so.
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