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Have you unplugged the existing breaker to see what kind of shape the panel is in? With the bad connection like you described it's possible that the lugs that the breaker plugs into are damaged. I recommend that you do a visual inspection before you go any further. In the meantime I can look for a breaker.
I highly recommend that you replace the panel. Lugs that have overheated will continue to deteriorate. If arcing damage occurs, it can be unsafe.
If you are not satisfied with my help, please do not rate the service and you should not be charged. If you are charged, contact customer support or let me know and I will contact them for you. Thank you
Hi, I'm Mike G and I'll be assisting you. General Switch breakers may or may not be available used, but I suggest a Siemens or a Cutler Hammer BR series for a replacement.