Counter Balancer, Andersen Perma-Shield Narroline Window, Left Hand - # L10 / 1827Andersen replacement sash balancer is used on Narroline double hung windows manufactured from 1968 to 2012. Balancer maintains the position of the window sash They are found above the upper sash in the head jamb, and are located on each side of the window This balancer is used on the left hand side of the window as viewed from the exterior of the window When replacing balancers we recommend replacing both balancers and the window side jamb liners, the