Another thought...if it is indeed plastic, if one has failed the others are right behind at some point. I know this by experience. I've replaced my plastic bowtie lugs with conventional metal lugs so that I can play them without fear of breaking the other lugs. I keep the plastic ones tucked away for the sake of future originality.
Can you tell us the serial number and/or date stamp on yours? I'd like to document it. Thanks.
Mike