sparkfun Raspberry Pi Zero Wireless Camera Kit Setting Up page 8

Identify the smallest screws in the baggie of screws that came with the kit. These will be used to affix this horn to
the base of the pan-tilt mechanism.
Place the horn in the base as shown, then screw it down by inserting the screws from the bottom and threading
them into the horn. Note that there will be extra screws, even beyond the ones to be used later. This is generally
true of all the screws in this set.
Next, identify the larger self-tapping screws. These will be used for assembling the next part of the mechanism.
Find the two pieces pictured below that will sandwich the first servo. Note the orientation of the servo in these
pieces.