#1 What is wrong with this picture
#2 There is a gear missing
It is a different design than the first unit.
#3 Here you see the two shafts. The upper one is from the first unit with the busted case - the lower is from this unit. The right end is missing two teeth (can't see that here. Also the shaft is a different design. The collar just to the right of the teeth on the upper shaft is part of the shaft - not removable.
On the lower shaft there is clearly two sets of teeth - what goes here?