Jim,

Here's a link to the kind of drill chucks they would use to drill 
really small holes with a drill press or small lathe.

http://www.use-enco.com/CGI/INPDFF?PMPAGE=451

Those are rather expensive, though I suspect that you could find 
lower quality versions for somewhat less.

Brett

At 12:45 AM 4/5/2012, you wrote:
>I know that this is a long shot, but does anyone have parts for an 
>old Spregnether horizontal seismometer?  Specifically the lower wire 
>hinge.  The piece is a short wire with a round brass fitting at each 
>end.  I tried to make it myself using piano wire and round brass 
>stock.  But drilling the round brass stock to insert the wire into 
>has been fraught with failure thus far since the very small drill 
>bits I purchased at the hobby shop keep breaking,  Also, any advice 
>on drilling an approximately .030 diameter hole in round brass stock 
>would also be appreciated.  Do machine shops do this kind of work?
>James Allen
>


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