Welcome. I'm guessing you are referring to something like those shown in the thread
Chicago plug From my understanding, they are no longer available as far as new retail. I think that some are able to unscrew. I have also seen molded ones, that would mean that it is unlikely it could still be used. If there was enough good beyond the plug, it might be able to be spliced. If you have the kind that unscrew, I think you can just rewire. So maybe ebay or such would have something that could be used. Or another machine with good wiring and plugs.
Good luck
Janey - Neat people never make the exciting discoveries I do.