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David,

    Your experiences with both the NSD-1000 and Century itself are
unfortunately not unique.  Several years ago I had a customer interested
in an NSD-1000, so I called an instrument shop that I do business with
to see what they think of it, since I had never installed one before.
The shop said they were nothing but trouble, and strongly advised me
against ever using one.  I ended up selling the customer an NSD-360,
which is a very good HSI that has proven to have a long service life.
Also, Century has never been accused of being very helpful to the
customer after-the-sale.  

    IMHO, the best HSI systems are the King KCS-55A, the Century
NSD-360, and the S-Tec ST-180.  Both Allied Signal (King) and S-Tec,
have great customer support, and a high-quality product.  

David Buckwalter
Avionics Systems
<http://www.avionikits.com>