Does anyone know how to tighten the passenger side window's little metal screw cap on the top corner?

I think mine is loose, if the window is down and not in the fully closed position and I close the door I can hear that "loose" sound from the window. I check and pulled on the window (towards the outside) and sure enough it gave a little. Not the same for the driver side.

Any idea how to tighten it? Thanks.

 

Take your door panel off it's the window, check your door screws though. Check the handle, you can take off the caps and tighten, and check behind the interior door latch, there is a small screw there.

 

I've checked everything and am pretty sure it's that upper corner black screw not being tight enough, I guess you have to take everything out to get to it huh? It seems like nothing is blocking it but I can't get to it!