I have single hung windows. Our home was built in 2003. There is only the number 2780 a symbol I can't read and then the letters HR. Is this something you can help me with.
Thank you
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Casey from SWISCO responded:
July 22, 2019
With this combination of attachments, you could have either an S380-28 or S385-28 channel balance. You need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need to weigh your sash to determine which option you'll need. There is a chart under the product description that will tell you the correct spring strength option. Thank you and let us know if you have any other questions or concerns. 
Comparison of the S380 and S385 balance shoes.
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