[CAUT] String Leveling question

[David Skolnik]

Dear Listees,
A few questions have been prompted by my very recent acquisition of a 
tool many of you have probably owned for some time:  Joe Goss's brass 
String Level.  I'm quite enamored of it and it will, at some point, 
probably get me into as much trouble as did Tom Lowell's gauge.  I 
apologize if I'm overlooking anything obvious, or if there was a 
recent discussion of this that I'm unaware of.

- What, ideally, should bi- and tri-cord level be parallel 
to?  keybed? stretcher? plate?  top of agraffe, (if not rounded, a la 
Bechstein)?
- How often do you come across ideal?
- How many times (at which points) do strings get leveled after stringing?

Thanks.

David Skolnik
Hastings on Hudson, NY