A 15 builder friend told me this doubler on his spar had the holes misaligned. A proper drill size or rivet would not go through. Has this happened on others? I'll check mine tomorrow.
Edited for NOT go through. He said on one end of the doubler holes matched, but the other end did not match. Not clear if it is progressively offset along the length. I suggested using a drill bit solid end to roughly quantify the offset. The second spar was just fine. L/R not specified.