It should be noted (here is as good a place as any) that during the casting of the full GFA appliance being applied here, a strip of mesh similar to wig lace but less st retchy-more like tulle-was placed in th e mold along the top midline of the head so that there would be very little give to the appliance. On real people, the scalp is attached rather ftrmly to the skull, and there's not much stretch in any direction; by doing essentially the same to the appliance, the silicone on the top of the head will not over-elongate and allow the appliance to be ill fitting.