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Step 4Press, File and Sand until Flat
The heat sink must be flat. The best way to achieve this is not to deform the metal during the process.
However, my aluminum was a nabbed from an old camping plate, and the tin snips deformed it somewhat. So, in order to flatten it for good contact with the transistor, a few more steps:
-- Press it. I used the end of a file handle. But using a good vice, perhaps between two pieces of flat steel would work better.
-- File it. Where the material resisted, filing took out the high spots.
-- Sand it. After filing, a smoother surface is need for full contact.
However, my aluminum was a nabbed from an old camping plate, and the tin snips deformed it somewhat. So, in order to flatten it for good contact with the transistor, a few more steps:
-- Press it. I used the end of a file handle. But using a good vice, perhaps between two pieces of flat steel would work better.
-- File it. Where the material resisted, filing took out the high spots.
-- Sand it. After filing, a smoother surface is need for full contact.
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