Join Date: Jun 2012
Location: Melbourne, Australia
There is a good chance the screw itself isn't silver but plated brass as it's hard to get and keep a decent groove on a silver shaft. Silver and brass need to be soldered with a torch and silver solder (irons don't get hot enough, they can only do antimony/lead) - and it sounds like a delicate one so a jeweller's torch is called for. Don't bother with a jewellery store, look up the local directory and find a real jeweller (or look out for a very old man sporting pince-nez and fried fingers) - they're a lot cheaper!!