I'm having an issue with replacing plastic knuckles, the kind where the spring is a small plastic tang on the knuckle - p/n is 9050-56. Take a look at this video and tell me if you have encountered this problem and what solution you may have come up with. And sorry for the shaky hands, that's all me.
Obviously the knuckle is opening too far. I believe the reason is the portion of the knuckle that is supposed to "catch" on the inside of the coupler body, doesn't - it's too short (see picture, dimension "A")
My favorite parts supplier has been providing me with two types of these plastic knuckles over the years, same p/n, just made by two different folks. And over the years I have encountered this problem on at least half the couplers I'm repairing, and I'm tired of it.
First of all, I like all my couplers to work properly and smoothly, so for those of you who are thinking of suggesting "glue them shut" or similar, I thank you for your considerate thoughts, but I will not be doing that 
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I welcome any and all other ideas, especially if you tell me that you've never had this problem, and have replaced hundreds of these knuckles, then I will be asking you who you buy them from. Thanks!
George
