Toyota Repair: 1990 Camry Window Adjustment & A/C, 1990 toyota camry, plastic knobs

Question
Can you please explain how to adjust the driver side window "door glass stopper" " (Page BO-4 of the 1990 Toyota Camry Repair Manual) on a 1990 Camry.  At the moment the window just goes up until it hits the rubber window gasket at the top of the door.  It completely closes and is aligned well.  However, there is about a 1/4" gap between the metal lip on the lower front window bolt and the adjustable metal angle "door glass stopper inside the door.  

I guess that I need to know if I should close the window and adjust the pieces to touch?  Or should I close the window on a temporary spacer (for instance 5 or 6 pieces of paper) and adjust the stopper pieces to touch (so when the paper isn't there the door glass stopper will stop the window instead of the door gasket.)?  Or, maybe there was a piece of rubber in there at one time that has worn off and that I need to replace?  Or, something else entirely?

On another topic entirely, I am still considering trying to repair (it had a leak) and convert (to 134a) my air conditioner.  Everyone says to change out the drier/receiver.  Why is that?  Since I will have the system open would there be any advantage to removing the compressor and servicing it in any way?  Is there any maintenance that I can do to the expansion valve (which is where I suspect the leak is at)?  Any pointers before I jump into this?  Please note, my budget doesn't allow for replacing parts if there is any chance of resurrecting an existing part.

Thanks Ted, we really appreciate the time that you devote to this.  Your answers are great.  I have gotten a lot of good tips from your archives.

Kep


Answer
Check the glass carefully, there should be two round plastic knobs mounted on the glass on both ends that contact the angled metal bracket, one of those plastic knobs may have fallen off allowing the window to go to high, check inside the door to see if the pieces are in there. The adjustment is pretty much trial and error.
Forgot to address the A/C question.......
The receiver drier removes moisture from the system, although it may be a good idea to replace it you can use the existing one if money is an issue, the compressor is basically not serviceable, the expansion valve has some o-rings that can leak, you can try replacing the o-rings but there is quite a lot of work involved removing the evaporator from the car.
At this time I would recommend changing over to the R-134 and then see how long it lasts, if it's Ok for six months to a year I would seriously consider just adding freon as needed, if it all leaks out in a week or days it's time to consider repairing the leak.