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After all the holes are finished the whole thing comes apart and the tedious deburring and cleanup takes place.  In the second picture I am reassembling the flap after that process.

      A word about how many clecos to use.  I had plenty of clecos so I used them.  I did not like putting a cleco in much less than every other hole. The technique I developed while match drilling was to start at an end and drill a hole. Drill a hole at the other end of the rivet line.  Check alignment.  It is still possible to fix a slight realignment at that stage.

      Then do a binary split of the rivet line. Drill the middle hole then the two middle holes after that and repeat until you have a cleco in every other hole. Then drill all the remaining holes.  Updrill all those holes and put a larger cleco in all of them. Remove all the smaller clecos and updrill those holes.

      I just did a rough guess as to where the middle was each time and I often ended up with two holes between a number of clecos. This was fine and I adopted a rule that I never drilled a hole that wasn’t next to at least one cleco. It has served me well ever since.  The pneumatic cleco tool was great for all those clecos.  Working on a piece with just few holes I use the cleco pliers.