One of strengths is logic. And I can tell you all that this matter is very simply resolved by logic.
Does there exist a sales thread anywhere that is selling a fake represented as gen?
If so, is the person who made the sales thread am member here?
If so, then ban. If not, then case closed.
it also happens in much larger threads eg engineering applications with bolts - nothing to do with lubrication, unfortunately
people solve this by using different grades of steel - which wont help you at all in a watch case!
the fact that its on his wrist just turned the cheapest Patek into a little dearer Patek at some future auction
he is obviously not that into watches, and just bought the most modest of the best brand IMO