I the flap come out once and when retracting it damaged the doubler under the wing skin behind the rear spar. On the 6 this doubler extends behind the spar while on the 7 it ends at the spar. My solution for the damage was to trim it off. See the link below.
http://www.vansairforce.com/community/showthread.php?t=47925
During flight or on the ground I know my flap in the down position will not catch the wing skin unless someone leans on it. That is why once I land I now always retract them 5 to 10 degrees before I park so this will not happen.