QUESTION: I've been able to obtain some virtually new Weaver rolling stock at rock-bottom prices/dirt cheap but they come with plastic couplers - some of which barely operate. Short of totally replacing the trucks and couplers with die cast at $20 a pop per car, any tips on improving the operation of the plastic couplers will be most sincerely appreciated.
Thanks! 
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Good morning T-Mac
If you don't need them to operate? just wrap a thin wire or twist tie around the shank to keep them closed. Did your rolling stock also come with the Delrin wheels (plastic) ?
Clem
Good morning T-Mac
If you don't need them to operate? just wrap a thin wire or twist tie around the shank to keep them closed. Did your rolling stock also come with the Delrin wheels (plastic) ?
Clem
Just my opinion but, I believe you will have more trouble in the long run with the plastic (delrin?) trucks, as the "metal" wheels that come in those plastic trucks are too thick. Yes, those plastic couplers tend to open at will, and the only way to keep them closed is constantly fiddling with the metal spring.
Although expensive, up-grading to the latest Weaver die cast metal trucks AND couplers will solve your issues, plus add weight to the cars.
Parts list on the Weaver website shows the diecast couplers without the complete truck. P717
We (Fort Pitt Highrailers) had trouble with the plastic trucks , but found that pulling/widening the wheel sets a small amount corrected the problem. We used this old battery terminal puller from Sears tools.
T-Mac
I really don't know what to do to make them operate, I change all mine to Kadee's. If you have any with the Delrin wheels or purchase more Weaver with the Delrin wheels let me know and I will trade you Weaver metal wheels for your Weaver Delrin wheels.
Always looking for the Delrin wheels (3-rail).
Clem
I used Super Glue until all cars were re-retrofitted with spring die-cast T&C.
It was mainly a height issue matching to other cars vs. opening up on long trains.
I pass up all those types of cars on ebay.
Last search of die-cast T&C sets yielded nothing. I think we have another shortage again. None to be found at my (go to) suppliers.
TMAC
Still have many Weaver cars that have not been upgraded to Die cast T&C's . No issues , but I do use small black rubber band to ensure the couplers do not open up. I think the bigger issue with the older weaver cars is they are too light.
Still very nice cars
BTW try some of their new cars they are awesome
Many thanks to all of you for your replies! 
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