Casey from SWISCO responded:
October 22, 2020
Hello, thanks for posting! It looks like you could have either our S380-33 or S385-33. The difference between the Series 380 and the Series 385 lies in the depth of the shoe. Take a look at the picture below for more detail. Once you have determined this dimension you should be able to select the appropriate balance. Comparison of the S380 and S385 balance shoes.
Because the stamp on your channel balance and the weight of your window offer disparate information in regards to the spring strength, I would recommend getting an exact weight on your window sash and referring to the chart on the product page when selecting your stamp option. |