Ok that's the screw that will make you Have a bad day! That's all that keeps your slide motor from popping out. It actually is held in by gravity and that screw keeps it from moving up....the reason is if for some reason you have other troubles with your slide short bad motor etc you can remove the screws on both ends and reach in behind the weather stripping and pull the motors up out of the gear then go back outside with help and push the slide back in.....
The screw doesn't actually screw into the motor and hold it tight it just screws through the side of the camper and part way into the vent holes of the motor keeping the motor from moving up.
https://youtu.be/DviEbWT3lUo
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