Back in the mid 90's, Michael Greene of Roomtunes fame, (sorry for any mis-spelling) made his bid to convince me that the kind of screws (re. what they were made of), that held the circuit boards in place, would make a dramatic difference in the component of which they were applied. I would assume he was trying to control the resonances to the circuit boards by said screws. While I have never been in the position to test his theory, I remain skeptically unconvinced that this would make any worthwhile improvement other than drive up the price of the component. IMO.
What’s your vote for the most ridiculous, overpriced, and useless tweak?
My vote: Furutech Outlet Cover 105 NCF $220, with “special crystalline material that has two “active” properties.” https://www.thecableco.com/outlet-cover-105-ncf.html