Replacing springy jaws on Monitor 2 input panel?

I received a free pair of Monitor Series 2, and one of the hinged springy jaws that hold the speaker wire in place has disappeared. The spring is still in the hole. Since the input terminal is part of a cap board I can't just use a generic replacement terminal. Is there a way to buy a new plastic "jaw" and install it? Googling has been no help. The speaker works if I hold the wire in there with a big screw, but it's really hokey.

thanks,
jim

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