remove glazing beads with a chisel or knife,using plastic packers,or any materials around pack up the side neer the hinges so the glass is central or higher,then push a packer in the top tight.then pack the sides equal.now using a chisel or pry insert between glass and upvc frame at top ,lift and seperate the two and insert packers to correct height.make sure packers dont foul glazing beads.re insert beads
b.green, October 2006