We moved into a house where the existing vinyl windows were not
installed correctly. Wind comes in between the window and the
casing. On one window, the top one falls down as soon as it is
unlocked. I have already tightened the adjustor screws as much as
possible, but it is not enough. I believe the only way is to shim the
window. I am looking for the best/easiest way to do this. I am up
for any ideas. Thanks