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2338 coupler arm droop

Additional circumstances surround the function of the coupler arm.  It drops downward. So it opens particularly on the 031 figure eight portion of my layout. 
It is reliable until about the third Round  trip then the train is left behind. Then an emergency stop needs to be made to prevent a major train Crossing accident! Here is the movie. 
Replacement spring or a specific washer to make the coupler horizontally placed?

what would you recommend?


Videos (1)
Original Post
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