Hi Jim,

Highly doubt a spare will be found due to the age of the instrument.....it
was
discontinued many years ago....even though it a very reliable and highly
effective
seismometer.

I think its a piece one can either carefully homebrew or have a machine
shop ($)
make.  I think the part can be made from 1/2" X 1/2" X ~1.75" length
keystock iron
found in hardware stores.  Its sold as square rods about 1 foot long. 
"IF", you try this,
I'd take along a file to make sure the keystock is metal workable (the iron
can be filed);
some keystock is heat treated and is so hardened it might not be workable. 
It doesn't
have to be a exact match of the original to function.    After drilling the
wire hole; I'd
install two setscrews on another opposite side, to hold the wire from
moving.  The
boom "prong" holes are probably deep enough to where its about 2/3rds
through the
thickness for stability.  With your boom prongs, you can measure their
relative distance
from the centered wire hole center.   Making this part is probably the only
alternative.

Take care, Meredith


> [Original Message]
> From: Larry Cochrane 
> To: 
> Date: 4/10/2004 11:43:38 PM
> Subject: Fwd: SPRENGNETHER 5000 HORIZONAL LONG PERIOD SEISMOMETER
>
> Hi everyone,
>
> I was asked by Jim Allen to forward the following message to the list. He
> uses AOL so he's not on the PSN-L list any more. -Larry
>
> I just received a Spregnether 5000 long period horizontal seismometer
> similar to the ones on Meredith Lamb's website.  However, it is missing
the
> lower far rear piece that clamps the pivot wire.  Its the piece that
floats
> just ahead of the frame (approximately 2+ inches long).  If anyone has
parts
> or know a source for parts for this unit I would appreciate hearing from
> them so I can get the unit working.
> If anyone can help, please respond directly to my email: radiotel@.......



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