For anyone that considers doing this, please don't. Zen himself has said it is not necessary and strongly advised people against doing so. If you have a sidewinder that is not hitting to your liking, this is NOT the cause unless during manufacturing the anodizing wasn't removed from the top edges of the tubes. In that case, contact Zen or Jason at electronicstix.this is what i did to my SW, you can do this as a last resort, as it is the switch needs to be fully screwed in, tightly so that the edge comes in contact w/ the outer unanodised ring, I did this so that I would get a better ground and not have to worry about screwing the switch in so tightly.... heres a pic.....
wow. I'm sorry. I assumed you guys had those a long time ago
The difference between springs and magnets is the spring carries current but with magnets, the switch post has to contact the switch body inner wall. The spring can be pressed straight on, the magnets have to be pushed to the side while pushing the switch in.
The screw will make no difference, it's a wise tail. Your stainless screw is perfectly fine.
the magnets can break if you are not careful and let them snap together. I use both, but tend to gravitate to mine that have the spring.