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The stock safety wire as came from the factory was not much better than nothing.
Safety wiring was in it's infancy in those days.
There are many videos on Youtube on proper safety wiring procedures. Torquing a bolt to proper spec and using safety wire, it will not come loose if design ultimate load in not exceeded.
On flywheel bolts, lock washers will fail. Too much torsional vibration.
It has to do with the laws of physics.