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The problem here is that if you tighten the coupler pocket screw enough to remove the vertical play, it no longer self-centres properly. I was able to resolve this by tightening the screw just enough to avoid the coupler drooping, but not so tight as to stop the coupler from self-centreing. I can also say that Kadee's advice on couplers for the Dash 9 and AC4400 is incorrect - I tried using their recommended choice of #28s and found them to be far too low. #21s at the cab end and #27s at the back are a much better fit in my experience.
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