12
High Frequency Driver replacement continued:
headless screw
nut
locking washer 
flat washer
7 Four nuts and eight washers may be removed from the driver using the 8mm open end wrench. Turn counterclockwise to loosen and remove, clockwise to tighten. The other three are located around the horn assembly. Lift the horn up as the nuts are loosened. It cannot be removed otherwise. Notice that the flat washer is on the bottom, followed by the locking washer, and finally the nut.
8
9
Keep the four nuts, four locking washers, and four flat washers in a safe place.
The horn assembly should easily lift right off of the high frequency driver.