Product review (5 stars): Easy repair 30 minutes
Easy repair 30 minutes, flat  head screwdriver (preferably a long shaft and tight fitting) and 9/16 wrench. A crescent wrench or pliers (not recommended) will work the "left hand threaded" plastic nut on the end of the shaft is not particularly tight. Neither is the ring lock holding the shaft onto the ice tray, it slides away easily with force from the tip of the screwdriver. Pay attention to the direction of the shaft spacers and crusher blades, be consistent the way you lay them down and reverse the procedure to reassemble.

The "left handed thread" means the nut is removed clockwise rotation.