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FAQ: How do you make a 1:7 gearing ratio?
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Technic, Gear 40 Tooth : Part 3649 | BrickLink
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Metal 40T Tooth Gear compatible with Lego Technic like 3649 / 34432 – Metal Technic Parts
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Gears: Types of Gears – The Moment Makers
LEGO Technic Gears | 3D CAD Model Library | GrabCAD