3) Undo the two #4-40 screws on the light bulb housing and remove the assembly
from the contact probe, as shown below.
4) Loosen, but do not remove, the bulb clamping screws. The light bulb may now be
freely removed from its clamp. Do this by pulling the bulb straight out of the
clamp.
5) Inspect the replacement bulb pins to ensure that they are straight and parallel to
each other see image below. If the pins are not aligned properly lightly bend
them into the correct position. Correctly aligned pins will make installing the bulb
much easier.