I recently came up against this one, about the aileron hinge bracket cracking. The Van's recommendation involves inconvenient disassembly but I found that the necessary visualization can be accomplished with an inexpensive borescope that reflexes 180 degrees. The one I have is a Vividia HD USB borescope that plugs into a laptop. It just slips in the existing opening next to the aileron pushrod, reflexes and shows all the rivets required by the SB. No disassembly required! Just thought I'd throw that out there...