#22 I would say that it depends on the mosfet. Some of them have a piece of metal as back, those do work as a drain, but some of them don't and should therefore not need a mica shim. The ones that have metal backs also have mica shims. But the strange part is, that I have connected everything just as it was, only thing is that I have made other blocks. So the mosfets should be insulated just as well now as before.
But I have bought new mica shims and nylon bolts today, so now I am really ready to insulate those suckers, that I will do tomorrow.
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