Bob from SWISCO responded:
November 19, 2020
Looks like you have our 15-086 and 15-087 Balance Assemblies. This system uses Series 180 Coil Balances. Remove the hardware from the window to confirm. The video below shows how to do this. Note that the stamp on the housing may not be reliable for determining the weight you need. Give us the exact weight of the window sash, and we can work it out for you. |