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LEGO Technic Brick 1 x 2 with Axle Hole ('+' Opening and Bottom Tube) (31493 / 32064) | Brick Owl - LEGO Marketplace
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LEGO part 89652 - Black Technic, Axle Connector 2 x 3 with Ball Socket, Closed Sides, Squared Ends, Open Lower Axle Holes at BrickScout
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Amazon.com: LEGO Technic Differential gear box kit (gears, pins, axles, connectors) 27 pieces : Toys & Games
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