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Detail of the glue grooves and set screw holes in the joint body and pivot.
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Sand the old glue off the pivot and joint body. Drill out the four glue holes in the joint body. Carve, file or grind a groove around the inside of the joint body connecting the glue holes, and in the plastic of the pivot. Be carefull to go around the metal of the pivot. I put several "stitch" grooves across the pivot groove to allow glue to flow into the grooves even if the body and pivot grooves didn't align perfectly.
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