The key to getting the tip ribs in the right place is to make sure they are placed in such a location as to be aligned with both the ailerons neutral and the flaps up. That takes a lot of back-and-forth to finally set.
Then match drill the aft few holes after marking off their proper locations. This locks the rib into place.
Then pull the tip off and complete the remaining holes per proper spacing.
Following this, the holes in the tip get countersunk and the rib gets riveted in. I'm holding off on the last step because my wing tips are too long by nearly 1/4". I'd rather work on the fiberglass without the ribs in place.
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