ITEM NAME:Replacement 3 Plastic Gear Base 3 Rubber Gear For Magic Part Spare Bullet N M7A9 Description&Preview.All rubber gear in Magic bullet are reverse threaded. Installation requires tools: a screw driver or Wrench, a thick cloth.To remove your broken piece, you need to use a plier, a thick cloth, and mineral oil or any other oil for lubrication.Fit for Magic Bullet(250W).