Mr Christmas World's fair Parachute ride Replacement  Gears.
These are the most popular replacement parts that fail. Due to stress in the gear box
PICK A GEAR
A) 10 tooth 2mm plastic 
B) 10 tooth to 20 tooth 2mm plastic
C) 26 tooth 3mm plastic
Note: Gear box cover and Shafts are not included  with gears