Another tip. When reinstalling the window, secure the corners first, lower left, upper right, lower right, upper left for example before installing the rest of the screws. This will insure the window is seated evenly all the way around because it is possible to "pull it in" a little off square and because one side is "pinched" you may not be able to pull the other side in correctly. I learned that lesson the hard way, a friendly glass technician advised me of this technique which I had to resort to in order to seat the window properly.
Any glass shop should be able to supply the black butyl tape you may need.
