rubber teeth on blender worn down

My son is infatuated with things that spin. He took the blender jar off of the blender and held the bottom of it against the teeth of the drive coupler. Apparently it made a really cool noise to him, but wore the teeth down so much that they would no longer contact the metal blade coupler. I was stoked to find the part online... 10 minutes before I was online looking for new blender. I simply pryed up and off the old one, and put the new one on. Thanks to partselect I saved over 100 bucks by JUST replacing the part!