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Here's a old pump that I have to rewire. The Cover plate screws have rusted in place, and the Cover plate itself was not water-tight and was hanging from one screw. I just reached out to move it and the screw broke off. I'm not sure if I can re-tap the holes because this is solid cast-iron and I think it would destroy my tap & drill bits (although I have not tried this yet).

Have any of you run across this, and if so, what did/would you use to seal up the built-in j-box? I have all sorts of water-tight cover plates in my truck but need to fasten them somehow. Thanks in advance for your suggestions!

- Electric-Ian