Balancers

It looks like you would need the S770 plain channel balances with the knife lock shoe similar to the 15-014 attached to the pulley, which we can supply through a custom order. I'd recommend removing your knife lock shoe from the window entirely to confirm that it matches the specifications below. 

Dimensions for 15-014

To get started, we'll need to know the exact weight of your window sashes for both balance lengths to determine the strength options for your replacement balances. Lastly, we'll need to know the exact number of balances that you need for each length, with the minimum being two of each. Thank you!