The cap to the motor fell of! What to do. Remain calm, Inhale, Exhale.
You will want to get the metal rod in the center of the motor, between the metal tabs on the cap. If you are working with the plastic servo motor,tabs go under the blue cap. A small screwdriver will come in hand, or a toothpick, angle the motor and the cap so you are looking down at it, when putting them back together.