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Jack Stone's Cockpit: A Molding Manufacturing Mystery - BrickNerd - All things LEGO and the LEGO fan community
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LEGO part 85489a - Black Train Wheel RC Train, Spoked with Technic Axle Hole and Counterweight, 30 mm diameter (Blind Driver) at BrickScout
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LEGO® Element Development: the Friends Hoop – Interview with Poul A Thomsen | New Elementary: LEGO® parts, sets and techniques
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LEGO part 85489b - Red Train Wheel RC Train, Spoked with Technic Axle Hole and Counterweight, 37 mm diameter (Flanged Driver) at BrickScout
What is the interference lock offset of a LEGO stud/hole such that it fits snugly into another piece? (i.e. What are the snap mechanism dimensions?) - Quora
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