Not sure what that would be. Does the mixer run okay without it? If so, perhaps you don't need to worry about it. Reminds me of a story my grandfather used to tell on himself. Back in his drinking days, he and a buddy of his had had a few, and decided to take a Westclox Baby Ben alarm clock apart to see how it worked, and when they put it back together, they had a few parts left over, but the clock kept perfect time.