In article .com,
"nrp" wrote:

But I understand flutter also relies on the original torsional
stiffness of the wing being preserved. That if it is not (i. e. a
wrinkled wing skin) the flutter margin is reduced. Might even a
properly balanced control surface still flutter if the primary wing
stiffness is compromised? or is the control surface CG the only
determining item? THX


Flutter can also result from unusual airflow exciting a surface (such as
the rather large dent in the aileron tip). It is a function of
stiffness, true airspeed, balance and external excitations.

The owner did the conservative thing -- after all his insurance company
was there to stand behind him. Yes -- the whole thing was obviously a
major PITA, but everyone came out fine. Congratulations!