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Originally Posted by petter
Ok, I will try and do that, but they weren't before so therefore I don't think it should be nescesary know. Btw, the components where the bolt would be in contact with metal, they are insulated now as they were before.
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TerraMex is right on this - looking at your picture the trouble is very clear. the back of the Mos usually have some sort of electrical connection. In your picture you can tell that the screws are making contact with the back plate.
have a look here as one example notice that the back also works like the drain:
http://www.usinternet.com/users/kyle...ic/IRF-510.pdf