Reply to "couplers on Lionel Standard O gauge cars"

I have had this problem with The President series cars,  military heritage cars, ATT cars, passenger cars (Polar Express and North Pole Central).  I seems to be present throughout the standard O-gauge cars. I tried using a technique I saw on YouTube, bending the armature under the knuckle and the armature broke before I  could even bend it as suggested and I have not been able to get a replacement armature from Lionel or through TrainZ. This happened on the Rosie the Riveter box car, if you want specifics.