I kept thinking I need a thick plug, something that blocks the cold air. You have a great point, I could just make a plug and glue it to another plate. I could even engrave something cool on it like @tony did with the sewer cover engraved coasters. Would have to get some more magnets though. Lowes, where I bought the cable and ferrules and looked at what was available for ideas does not have any rare earth magnets. Two associates I talked to were unsure of what I was even asking. Neodymium even perplexed them more. JoAnns salesfolk were likewise stumped. I’ll have to check out @dan’s online supplier.
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