Product review (4 stars): Easy fix, but...
Such a small part can do so much damage.  My son, The Hulk, broke this part in the machine.  If you look at my door lock review, you will see that you SHOULD CALL A REPAIRMAN.
I replaced this myself before the repairman got there so he would charge me.

So  If this part breaks outside of the machine, go ahead and fix it yourself.  If it snaps off inside the machine, CALL A REPAIRMAN.