There is LOTS of info regarding the galvanic effects of various metals with aluminum at: http://www.metalogic.be/MatWeb/reading/mat-cor/al___bim.htm de Randy, W7HR <hamradio@emerald.oz.net> -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com