How about the fact the materials are transported around the world in all different directions. What if the screws vibrate round more in one direction than the other when in transportation?  Do people with amplifiers nearer the magnetic poles get worse sound because things are magnetised more?

I'm sorry but to me it seems more likely you are imagining the effects as they would be so small. Still that does not mean you can't make great equipment, just that you probably waste a lot of time doing silly things like not using screws.

I'm not going to bother replying anymore as for one I have not read the entire thread or indeed your full post, but mainly because I just intended to have a giggle at the pun and leave it at that. I have no desire to enter into a heated 'debate' right now, especially given your attitude, which I accept is probably a lot to do with the thread I have not read so I will let it pass.