Servo oscillation help

[Tom Simes]

I've got a problem with an aileron servo that I'm hoping the collective
wisdom here knows an easy remedy for.  On one of my ailerons about one
in three times when the surface is at neutral if I pluck the aileron or
let the stick bang back to center, the servo will go into oscillation. 
A very light pressure or slight stick displacement will stop it, and it
only occurs when the servo is at center.  As far as I can tell it's
not happening in flight (my guess is the aerodynamic forces are
dampening it).  The first time I noticed it, I immediately thought the
pot had a problem around it's center point so I swapped in a brand new
servo (same type, Futaba 3004). To my surprise the new servo acted
exactly the same way, so that lead me to believe the problem is not with
the servos.  Now my guess is I've somehow perfectly balanced the
mechanical linkage resistance to the servo's startup force.

At this point I'm thinking about sealing the aileron gap in hopes of
changing the mechanical resistance a smidge.  Has anyone else seen or
solved this problem?

Thanks!

-- 
Tom

_____________________________________________________________________

       |  ,  |               Tom Simes
---------(@)---------        AMA 230068
        --|--                NSRCA 3830
          '                  nsrca at shinymetalass.com
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