I use titanium or stainless steel screws with the Allen head; the brass is too soft a metal, I don't like it. I am concerned only that they are non-magnetic.
Acoustic Sounds recommend titanium screws, and you can buy a set that includes different lengths of screws, on eBay for a nominal sum. Do I necessarily believe that titanium (or brass) screws can turn a cartridge/headshell sow's ear into a silk purse? No. As someone else said, the only important thing is to avoid screws that are attracted to a magnet.
Lewm, If you do not have a detachable head shell using Ti screws are asking for it. Titanium galls like crazy. You might get away with it if you use anti seize but I would stick with stainless or aluminum hardware (only using like nuts!) Some poor bloke is going to use ti screws on his SME V and permanently mount his cartridge. I wonder if Acoustic Sounds is going to pay for the mistake?
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