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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. |