Emily from SWISCO responded:
June 11, 2021
Hi there! It looks like you have our Series 395 channel balance. You'll also need to remove your sash and weigh it to choose the appropriate spring strength option. There's a chart on the Series 395's product page that shows you which option you'll need based on the weight of your sash. If you have any further questions just let us know. |
Emily from SWISCO responded:
July 6, 2021
I'm afraid the stamp on your balance is outdated and doesn't tell us what spring strength you need. If you're not comfortable with removing the sash yourself, a professional should be able to help. I'm sorry we can't offer a better solution. |