Andersen 637 Narroline Sash Balancer

The Andersen 637 Narroline Sash Balancer seems to be a good quality product that is easy to install. The reviewer, who had a 36-year-old house with multiple windows, purchased two balancers to fix a window with broken cords and found the installation process to be straightforward with the help of the included instructions. One complication the reviewer faced was having to cut open sealed and painted seams from previous owners in order to remove the jamb liners for balancer replacement. Despite this challenge, the instructions provided were clear and covered all necessary steps. The reviewer also expressed some concern about the longevity of the balancers, as they were stamped "Made in China" and wondered if they would last as long as the original Andersen balancers. However, the reviewer planned to further examine the original balancers and possibly develop a way to repair them. In a later update, the reviewer successfully replaced a broken cord with a similar nylon line and found the balancer to be operating well. However, upon inspecting other balancers in the house, it was discovered that some had broken plastic spools and springs, indicating the need for replacements in the future. The reviewer also noted that regular maintenance and lubrication of the balancer is essential to prevent difficult operation and cord breakage. Overall, the reviewer found the Andersen 637 Narroline Sash Balancer to be a good product that was easy to install. While there were some concerns about the durability and potential cost, the reviewer's experience suggests that regular maintenance and servicing can prolong the life of the balancers.