Did you break the shaft itself? Was it the ceramic type?
Does the propeller come off the shaft..so that it can be reused?
I have extra shafts (no propellers!) compliments of Hydor & can mail it to you.
If you broke the propeller itself..contact Hydor directly toll free at 1-866-493-6787..on Monday. They are in Ca..so compensate for the time difference!