Bob from SWISCO responded:
October 21, 2020
See our 15-087 Pivot Shoe, which uses our Series 180 Coil Balances. With this particular Series, going off a stamp on the housing isn't always reliable; look for a stamp on the coil spring itself instead. If there is none, or you're uncertain, give us the exact weight of your window sash, and we'll work out the spring weights you need. |