Bob from SWISCO responded:
October 1, 2020
This actually looks more like the 15-177 Pivot Shoe to me, which uses Series 152 Coil Balances. Let me know if you have further questions. |
Bob from SWISCO responded:
October 5, 2020
Are there any stamps on the coil springs? Those stamps indicate the spring weights needed. If not, or you are unsure, give me the exact weight of your window sash, and we'll work out what you need. |