If a disreputable fraud doesn't like a messenger exposing him as a disreputable fraud, which, of course is exactly what a fraud hates most, then the fraud will often make idle threats of a defamation action against the messenger.
After all, a disreputable fraud will threaten anything he thinks will stop the free speech that is exposing him as a fraud.
The problem with making idle threats is that if the fraud doesn't carry through on his threats and retain a shyster lawyer and sue -- an honest lawyer ain't gonna take the case -- then everyone will assume that the messenger was telling the truth about the fraud all along.
So the dunces on sci.electronics.basics trying to fake a thermo or engineering background _better_ march their disreputable fannies down to small claims court Monday morning with court fees and some papers in hand.
And try to make it look legal. Sprinkle in a lot of "estoppels" and "wherefors."
Bret Cahill