Sometimes when fitting a FD001+FD006 type seal, you may find that the plastic liner is brittle and will crack around the screws.
In some cases you may be able to use a washer as shown below to allow the screw to hold the liner in place preventing gaps between the seals underneath and the fridge door.
If there are gaps between the seal and the frame of the door, then you will need to use some adhesive to glue it into place.
Firstly undo the three screws holding the door onto the fridge.
Squeeze the glue into the gaps and hold until the glue has settled.
Apply powder if necessary
Apply some talc or baby powder to the seal where it is sticking. This will prevent the new seal from catching.
Flatten Seal with screwdriver
Use a screwdriver to flatten the seal as you close it. This will allow the seal to flatten. Leave the door shut for around 2 hours after doing this to allow the seal time to mould into the squashed up state on a permanent basis.
Heat seal to remove long gaps. Where long gaps appear, heat the seal and guide it with your scredriver. This will softer the plastic of the seal, and allow you to guide the seal into place.
If there are no screws holding the liner in, then you will most likely need to pull the seal out with a little force. Be sure to pull in the same direction as the liner, to make sure that you do not tear the insulation in the door.
Rub some talc or baby powder on the corner that it is catching, both on the seal and the surface it is catching on.
Put a small piece of weather seal under the seal, about 10mm from the corner. This will help to bridge the gap between the two different heights. The poor design of many models of fridges means that a seal has to perform miracles to seal between two different levels because of the white plug thing they put in the corners.
As you are closing the door, wedge a screwdriver in to flatten the seal as you close it.
Heat the corner of the seal with a hairdryer to assist it moulding into shape.
Firstly apply talc or baby powder to the hinge side of the seal, and also to the area on the fridge that the seal will hit on the hinge side.
Then as you are closing the door, gently put a flat screwdriver or similar(butter knife etc, something not sharp) between the seal and the actual unit.
You will need to make the entire side flat, so that it is not twisting at all.
Then leave the door shut for a couple of hours, and it will mold into the flattened state.
Unfortunately Westinghouse seals are always a bit tight, and this is the way to rectify the problem.