Replacement Parts for Magic Bullet Base Gear for Magic Bullet Blender MB1001 250W 2 Replacement Motor Base Gears and 6 Blade Gears to fit Original Magic Bullet Only. Base gear replacement for Magic Bullet MB1001 (120V,Max 250W,60HZ) Size:30mm diameter whole piece and approximately 4mm diameter internal screw hole EASY TO INSTALL: 1. Take a towel, with a towel wrap blade with his left hand holding.2. Right hand holding the connecting shaft, connecting shaft rotate clockwise to fall.3. When installing counter clockwise to tighten. Please check the model before order to avoid buying the wrong part.