Casey from SWISCO responded:
February 13, 2024
Hello, It looks like you have either our S351-29, with a 15-002 bottom attachment, or S390-29, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need a 2830 spring strength option for your replacement balances. You will be given multiple shipping options and delivery estimates to choose from at checkout. Comparison of the S351 and S390 balance shoes.
We also carry the 16-002 take-out clips commonly used with this type of balance. If you need top sash guides as well, we would need to see photos of yours removed from the widow to compare to our inventory. Thank you! Alternate image for 16-002
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