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Here’s a neat kit/music box guts so you can make your own –

Make your own music box melodies with this mechanical music box set. Comes with hand-cranked music box, one pre-punched music strip that plays the “Happy Birthday” song, 3 unpunched strips (48cm), a hole punch, and instruction manual to have you creating your own music box melody in minutes. 3″ long x 1″ wide.

Mechanical Music Box Set – [via] Link.