Amazon.com: KonHaovF 116PCS Gear and Axle Set for Technic Parts Compatible with with Major Brand Technic Parts, DIY Gears Assortment Pack(Gears Pins Axles Differential New) for Technic Building Blocks Set : Toys
Metal 24T Tooth Gear compatible with Lego Technic like 3648 / 24505 – Dark Ice Designs
LEGO Technic gear ball – BrickFair Virginia 2015 - YouTube