Heh Charles, the nesting approach appears an easy one that even I with 
little skill can manage.  Back to the hobby shop to see if they have the 
appropriate nesting sizes.
Seems a great idea - thanks
James Allen

-----Original Message----- 
From: Charles Patton
Sent: Thursday, April 05, 2012 10:17 AM
To: psnlist@..............
Subject: Re: SPREGNETHER HORIZONAL SEISMOMETER

One thought for a totally different solution.  Buy a pieces of the the
smallest K&S brass tubing from your local hardware store or hobby
store.  I think the smallest is either 1/16 or 1/32 ID.  Get as many
nesting sizes to get to the largest OD you need.  If you need smaller
than the ID, also get some brass foil 0.001" thick brass foil.  You can
roll your wire with the foil to get to the required ID.  Once everything
is sized, apply a bit of plumbing flux, and solder it together.  It will
be tight, and the essential TCE will be that of the bulk of the brass
tubing.
Regards,
Charles R. Patton

On 4/5/2012 9:19 AM, JAMES C ALLEN wrote:
> Hello Ed.  I like the idea of checking with my local trade tech school and 
> there is one several miles from me.  I also remember seeing entries from 
> BoB Barns years ago but not recently.
> Thanks much.
> James Allen
> *From:* Ed Ianni 
> *Sent:* Thursday, April 05, 2012 6:38 AM
> *To:* psnlist@.............. 
> *Subject:* Re: SPREGNETHER HORIZONAL SEISMOMETER
> In answer to your question,..... "Do machine shops do this kind of 
> work"?.......    I   think they may. I would call a few before I went 
> there and try to describe the "part" over the phone. I had an old leaf 
> spring from a Spenghnether years ago that I wanted to have duplicated and 
> one shop said they could do it but they were too busy at the time. There 
> was one PSN member who offered to do it for me but I have not seen any 
> "entries" from him in a long time. His name is Bob Barns. You might also 
> go to a local vocational high school that has a "machine shop" and talk to 
> the instructor........  Hope this helps.   Ed.
>
>
> On 4/5/2012 12:45 AM, JAMES C ALLEN 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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