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Push the screw heads through the liner.
Try and keep the holes as small as
possible.
Line up the holes and stick the gasket to
the face plate.
Undo the top screw and insert it back
through the face plate, into the same
hole it came from. Give the screw a
couple of turns just to hold on to the
face plate. When the face plate swings
downward you can locate the bottom
screw and carry out the same procedure.