sash balance

Thanks for writing in. Check out our S395-28 to start. Confirm that the nylon fittings at either end match your old balance. Your stamp code of 2590 is from an older rating system we do not use. You will have to weigh your window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the product page. And yes, all our Non-Tilt Window Channel Balances come fully assembled out-of-the-box.