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[quote user="switch123"]The shiny spot on the lock pin is normal, that is where it rubs against the back of the knuckle when moves up and strikes the top inside of the coupler.[/quote]   If that spot on the locking pin is normal, then it looks to me like a knuckle was pulled out of the coupler body by breaking the coupler body.  An alternative scenario of too much tensile force would be for the knuckle to break.  Another alternative would be to pull a coupler out of the draft gear.
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