Browse our Store Plastic Gear Cog For Nutribullet 600W & 900W Description Top Base Gear (Plastic) Replacement Spare Parts for Nutribullet Spare gear cog spindle for Nutribullet, made from High Quality, for the longest life of your Nutribullet. Install the Gear by first removing your old gear turning clockwise. When the new gear is installed you only need to snug it finger tight. The spinning motion of the unit will self-tighten the gear.