Temporarily clamp rib R13 in place being sure to get it positioned accurately.

Insert a length of 1/16" music wire through R13, the hinge arm, and into the receiving hole in R7c. Adjust the hinge arm to remove any bow from the music wire. The wire should form a perfectly straight line between R13 and R7c. Once satisfied that everything is aligned epoxy the hinge arm in place.

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