N/S Theater Car...coupler. Spring?

It connects between the 2 red circles.  There’s a hook on the truck pin (visible in your picture)  and it connects to the back of the coupler to keep it centered. Prolly gonna need some tweezers to hook it back under the plate on the truck.

Pretty good sized spring Ed.  I wonder if it would be easier to hook to the axel.. I don't think it will effect running conditions...  Good Luck.. you sure have been having problems lately... Where is the quality control... OH yea, I know it's Covid.. That's all I hear regarding every situation that is incorrect or problematic....👺

Sheldon, you were spot-on. Thanks. Hooked it back up and it works as advertised. Thanks.

@Quarter Gauger 48 posted:

Pretty good sized spring Ed.  I wonder if it would be easier to hook to the axel.. I don't think it will effect running conditions...  Good Luck.. you sure have been having problems lately... Where is the quality control... OH yea, I know it's Covid.. That's all I hear regarding every situation that is incorrect or problematic....👺

Can’t disagree. Seems often something is hosed up. Fortunately, this was an easy fix. Now I know how those kinematic couplers work. As my platoon leader said: “There’s always a bright side 😁