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Since the hole concerns you, also look carefully inside the cowling. That's where corrosion is most obvious. You should be able to tell if the hole was due to corrosion or due to something else, like impact from a sharp object (my front engine left cowling had such a hole, from an impact, which I had repaired with a doubler). If it seems to have come from corrosion, I would look elsewhere unless the rest of the airplane is squeaky clean (for instance, the cowling might have come from another airplane). I'm in Miami, have owned two Skymasters over the past 14 years, have seen corrosion inside cowlings, but never severe enough to bore through.
Ernie
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