Replacing spring clips on PSW202?

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I have a PSW202 subwoofer that is probably around 15 years old. Recently the spring clips started breaking off. The top plastic crossbar broke off and the spring and lever came out, so it does not hold the wire anymore. I am getting by with some alligator clips to the metal contact, however I'd like a better solution. Is there any way to replace the spring clips? I can handle a soldering iron up to a certain point... Are these parts available?