Product review (5 stars): Magic Bullet is back in business
After having our Magic Bullet out of commission for quite a while, I ran a search and found these on Amazon and ordered them.  They arrived promptly and installed easily.  I removed the bottom cover and found the shaft had a slot in it. I used vice grips to grab and hold the brass bushing left from the original gear and was able to remove it easily using a straight blade screwdriver to turn the shaft. The new gear screwed on by hand and my Magic Bullet is like new again.  Having a spare gear in the event I need it is good as well.