Worth a try to smooth out the bore and put in a new rotor. If you have a double drawer take the rotor out of the other drawer and put it in the damaged one to see if it works before going to buy a new rotor. If it doesn't work then you would have to buy a whole new tub and swap motor heating plate etc over. May not be worth it. Tubs and rotors are fairly expensive.
Lincoln Appliance NZ, January 2012