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I will throw my 2 bits in the for your consideration.  I am not an expert
either and don't want to be an alarmist but ---  Perhaps you should contact
an expert.

I would take the problem seriously as you obviously are and be concerned
that the aileron vibration might couple with the wing and cause a wing
flutter which would be a very serious situation.  Flutter is more apt to
occur at high speeds, high altitudes and low wing  fuel levels.  Perhaps
Don could assist.  Maybe Martin Holmann who monitors this site would give
you some free initial guidance via E-mail.

Until the problem is resolved, I would either ground the aircraft or  fly
carefully under the expert's tutelage with full fuel tanks, slow TAS and at
low altitudes.   Do not  accept this situation as normal. How big is the oscilllation at the ailerons trailing edge?

Jim Frantz

LML homepage:   http://www.olsusa.com/Users/Mkaye/maillist.html