Image Item No. Description  36009  Technic, Gear 8 Tooth with Pin Holes and Ninjago Flywheel Socket - Long Shaft Catalog: Parts: Technic, Gear  35185  Technic, Gear 20 Tooth Double Bevel with Clutch on Both Sides Catalog: Parts: Technic, Gear  24121pb001L  Technic, Gear Rack 11 x 11 Curved with Crushing Hazard Danger Sign and Red and White Danger Stripes Pattern Model Left Side (Stickers) - Set 42055 Catalog: Parts: Technic, Gear  24121pb001R  Technic, Gear Rack 11 x 11 Curved with Crushing Hazard Danger Sign and Red and White Danger Stripes Pattern Model Right Side (Stickers) - Set 42055 Catalog: Parts: Technic, Gear