Please help. No markings anywhere

Handy Person from North florida
Good evening. Most of our windows will not stay up anymore. I have taken this window spring out but do not see any kind of markings on it at all. It seems to be 1/2 inch wide and 30 inches long. I would just like to make sure I get the right ones ordered up. Thank you for your help
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Bob
Bob from SWISCO
SWISCO
Expert

Thanks for writing in. If the metal channel is 30" not including the end attachments, then this is likely either an S380-30 or S385-30. The only difference between these two channel balances is the depth of the bottom shoe. See the diagram below for reference. Measure your old balance's shoe to see what matches best.

Comparison of the S378, S380 and S385 balance shoes.
Comparison of the S378, S380 and S385 balance shoes.

You also have to choose a stamp option, which reflects the strength of the balance. Since there is no stamp on your balance, weigh the window sash. You can then match that exact weight with the correct stamp option. Let me know if you have questions.

Handy Person from North florida
Thank you very much for the help. That made it a lot easier to figure out. It looks to be 1 inch and the window is 32lbs. I will get them ordered up now. Thanks again for your help. You folks are terrific
Bob
Bob from SWISCO
SWISCO
Expert

Thanks for the kind words! We appreciate it. Let us know if you need anything else, and thanks again for contacting us.

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