There are two different types of Pinions for the Supernova2, they are distinguishable by the face with a small dot and the words 'lock' or 'in' as shown in the picture.
Pinion with the dot that says 'IN' is the 9 tooth design
THE PART NUMBER IS 23081
Pinion with the dot that says 'LOCK is the 10 tooth design
THE PART NUMBER IS 23045
