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				| Making damn sure I know which side is up
 Sharpie time! I have numbered all of the stiffeners and the skins so I can put the stiffeners back where they came from. I have also made notations on the skins of right, left, top, bottom, inside, outside, spar and trailing edge. I have heard horror stories of builders that final drill all the parts and then take everything apart, only to realize that they didn't mark anything and don't have a clue how to put things back together.
 
   
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