Nylon strings definitely stretch. My steel string I can string, take slack out and then play. It will remain in tune for long periods. Same process in a nylon string sees days and weeks of retuning. I overtune by a semitone for the first couple of tune ups and find it helps the settling in process. I don't think my grip strength is good enough to stretch by hand. I certainly can't pull the string to the same tightness as the tuning posts
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Martin
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