Excellent point. In my experience almost all anodize is non- 
conductive. The only conductive one that I recall is black zinc.

                                                                Curt

On Jan 10, 2008, at 4:01 PM, John Woodgate wrote:

>
>
> I noticed that the aluminium is anodized. Presumably this is a type  
> of anodizing known not to form an electrically insulating layer, as  
> it usually does. I agree that introducing third and fourth metals  
> (steel screws with zinc coating) is unwise. If there is no chance of  
> intermetallic reaction between the aluminium and gold ('purple  
> plague'), stainless steel screws may be advisable.
> -- 
> OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
> For very important information, please turn over.
> John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
>
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