Casey from SWISCO responded:
July 16, 2020
Hello, It looks like you have either our S351, with a 15-002 bottom attachment, or S390, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need to weight the window sash and choose a spring strength option based on the chart under our product description since your (2190) stamp is part of an outdated weight system. Thank you! Comparison of the S351 and S390 balance shoes.
|