the best way is to replace the whole pvc panel by removing the four beads around the panel(carefully with knife,chissels etc)they will pop out and remove old panel and replace with new.if you go to pvc door and window manufactures they often have mis measures going for cheap which can be reduced in size to fit opening.new panels can range from £40 to£200.tap the beads back into place with blows from a hammer .
barrie, October 2006