I have a silverline sliding glass door (5800 series) and I am in the process of replacing a torn weatherstrip (it's a brush fin style strip). The strip is on the vertical edge of the fixed panel where the moving door meets in the middle. Silverline sent me a replacement strip, but after taking the moving door panel out, there doesn't appear to be any straightforward way to remove the old wool pile strip and install the new one. The strip has a plastic base that inserts into a channel that is molded in the window frame to hold it in place. The existing weatherstrip looks to have been installed before the top and bottom of the door were assembled and fused together in the factory- meaning, there is no way to slide out the old weatherstrip and slide in the new since both ends are covered by the top and bottom of the frame; thereby making the open ends of the channel inaccessible. Perhaps there's some "trick of the trade" to performing this task, but it isn't obvious to me. Any advise would be appreciated!