Limit Switch Operation inside a Liftmaster 2280R Garage Door Opener

In the process of replacing my garage-door drive belt, the up limit adjusting screw became dislodged and stopped working. My to my pleasant surprise, the inner workings of this mechanism were not very complex and very easily repairable. So this video is for those who find that the limit adjusting screws have come dislodged/loose inside the unit and/or have stopped working.