Bert Sanders no longer does Graflex or Graphic repairs. He will walk you through the steps of repairing or building cloth shutter as well as other repairs.
Fred Lustig is expensive however I have never heard a negative [pun intended] word about his work other than to say he can be slow due to a backlog or the extra care he exercises.
45PSS at www.graflex.org is very helpful and does repairs
What others do for a CLA, you will have to ask each one.