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Amazon.com: LEGO Technic COMPLETE GEARBOX ASSEMBLY 2 x 4 x 3 1/3 Trans-Clear Wormbox gear motor REDUCER block Mindstorms robotics ev3 NXT transparent robot building power functions part 6588
LEGO Worm Gear with Old Axle (4716) | Brick Owl - LEGO Marketplace
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LEGO Worm Gear with Old Axle (4716) | Brick Owl - LEGO Marketplace