We have an SLK320. We get a slight water leak at the top front of the driver's window during heavy rain. I know there are 2 adjustments on the underside of the door(accessible after removing two plastic plugs). These adjustments move the window angle (slightly). I assume they are for getting the glass in tighter contact with the window's rubber seal to prevent leaks. Is this correct and how should they be adjusted to prevent a water leak at the top front of the window?