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The way I have always done it is from the inside, push the lip of the seal downwards and out starting at the top and working either side. Once the corners have been freed it becomes a lot easier to gently push near the rubber and see it moving completely. A 2nd person is useful to catch it in case it leaves unexpectedly
. When half way down either side it will probably lift out. To refit do as the manual says but as mentioned use some sealer. I used non setting screen sealer which is sort of like dum dum but in a caulk tube. Good luck
Tony
This is how I do it too, if for some reason, I need to save the rubber. I use a flat blade screwdriver and carefully tease the rubber a tiny bit at a time to the other side of the metal frame, starting in one top corner and working round till both top corners and one lower are free. At that point it can be lifted out easily.
But since the normal problem is a leaky seal and you will have a new one, it pays to cut the old seal away so the screen will just lift out of it without stress, particularly with the more delicate laminated screen. With new screens expensive and a long wait and good used ones hard to find and almost impossible to transport, why risk it?
Steve