Drivers window rocks in the frame - anyone fixed this?

My drivers side window is "loose" in the window frame. If you have the window half up and grab the top of the glass, you can rock the window back and forth slightly. Something's fubarred...

Anyone worked this issue? I have yet to tear down the door for an inspection but I suspect it's one of two items

- an adjustment bolt of some sort is loose
- a guide or sliding part has worn out

The ETK picture is not really very clear and I need to see if Bentley's has any insight. Thought I'd put it out to the board and see if anyone's dealt with this..

Jeff

go pick your self up a few slider/clip deals and then take the door panel off and replace them and grease the track. A few of mine were damaged beyond!