You can use brasso for the edges. it leaves a protective film on the copper, and that does not conduct heat very well. For me with and without braso was a temp diff of 0.5 degreees.
(Halfords, Brasso.. Are you from the Netherlands?)
- edit- I saw the penny... UK rihgt?
And if you use the right pollish, there will be no residue. Touthpaste also works fine!
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If it get's hot, it needs to be watercooled!
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