the tighter it is the better the heat will transfer between it...on a molecular level, metal bonds through its d-orbitals. You can take 2 lead weights and squeeze them together with your hands and they will stick to each other. This is because lead has huge atoms which are very "floppy" because they have lots of electrons in their d-orbitals. Heat will transfer through bonded metal much better than with thermal grease...my logic is to use as little grease as possible...
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