BrickLink - Part 42073c01 : LEGO Windup Motor 2 x 6 x 2 1/3 without Raised Shaft Base - Short Axle (Sports) [Motor, Non-Electric] - BrickLink Reference Catalog
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LEGO Technic BASH! 42073 Building Kit (139 Pieces) : Toys & Games
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Review: 42073 BASH! | Brickset: LEGO set guide and database