I think you mean non magnetic, non ferrous, screws.
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Toward the end of this thread: http://forum.audiogon.com/cgi-bin/fr.pl?fcabl&1401648535&openusid&Audiolabyrinth&4&5&st100 your topic question is discussed.
I know that Audiolabyrinth (Audiogon user name) has done a lot of experimentation on the topic but I can't find the article.
You could always PM him.