i think i did it a easy way i cut the bezel to cover the new double din as the standard ford radio is slightly smaller, then covered my screen with 5 layers of masking tape all way round. the rubbed wd40 over it so the filler will not stick to the tape. then smoothed the filler to the tape and leave to dry. remove the tape it should pull out easy (because of the oil) and look at the lines around the screen they should all be straight and level. then sand and re-fill where nessesary. my install was harder due to the hazard switch needed lifting and i installed a clock out a mondeo mk3. which needed the dash to be cut.