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Question on Pin Hinges

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Cubcrazy

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When was the change made from pin hinges to strap hinges?Did any true S1S have pin hinges or are these airplanes that are C,s that have been converted to the S?I have a what is claimed to be an S but has a build date of 1973 with pin hinges,my understanding is that this is probably been built as a C with the S wings added at a later date.
 

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