Lauren from SWISCO responded:
March 8, 2023
Hi Slawek, thank you for posting! I agree that your balances resemble the Series 770 channel balance. Your balances most likely use an older rating system since the stamps do not directly match up. What we recommend doing is obtaining the weight of each window sash and comparing the weight to the strength chart on the corresponding length's product page to choose the correct stamp option. For the pivot shoe, I recommend reviewing the dimensions of the 15-173 instead to see how it compares to your original. This pivot shoe cam can accept your 3/16" by 5/16" pivot bar. Please review and let me know if you have any additional questions! Dimensions for 15-173
|