Cantbelieve-
I'm not a chemical engineer, so I can't speak to potential damage to the gold with LocTite. I will say it's designed for use on watches and small parts so I'd think it would be OK - It's been on my wifes loves for while now with no adverse effect that we can see. Take a look at their website for their suggested uses. My wife and I also enjoy the knowledge that her bracelets are one more step towards non removable! She wears other gold that's been on for many, many years, so the loves fit right in.
As for the screwdriver, I found that a jewelers screwdriver of the correct size engages the screw slot perfectly. The gold screwdriver is like some people I've known - looks good but doesn't get the job done. If you put a screwdriver in any screw head that isn't the right size the blade can slip out of the slot. When it slips out it damages the slot of the screw. Being that the screws are so small and in full view, you wouldn't want them damaged. I made that mistake and goofed up one of the screws and needed to have it replaced...learn from my errors! Like I said, the Cartier sales people don't use anything but a jewelers screwdriver and there's a reason for that!
Bob