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Reply to "Electrocoupler doesn't want to close"

Well, you can lube them with some sort of dry lube.  If that doesn't help, you'll either have to replace them (and potentially get more with the same issue), or take them apart and polish the mating surface on the knuckle.  Most of the time when I have this issue, I find that molding "flash" on the knuckle is dragging and causing the friction that you see.

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