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When assembling the case and clasp together, cut a piece of filament that is about 1/4" longer than the width of the holes on the case's clip. assemble the case and clasp, put the filament through the clip's holes trapping the clasp inside the center and then use a soldering iron or a heated knife and melt the ends of the filament to the clip to make the hinge pin.

Heated jacket Temp controller (zip)

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