Need new balances

Question

I have 4 windows where the metal part is 29 inch and 1 where it's 23 inch.
The 29 inch parts say "28 3 GS Caldwell". The 23 inch part has no markings.
I have more pictures to share if needed.

Jasmine · Accepted Answer

Thanks for reaching out! Your window balances appear to be either the Series 351 or Series 390 channel balances. Since the 23" balances do not have a stamp, I'll need to know the weight of the window sash to confirm the right one for the replacements. The 29" balance can likely use the 2830 stamp, but it is suggested to double check that your sash weighs between 16 to 23lbs.

You'll also need to confirm the measurement for the depth of your shoe to confirm the right series. Take a look at the diagram below for reference.

Comparison of the S351 and S390 balance shoes.

You'll also need to confirm the measurement for the depth of your shoe to confirm the right series. Take a look at the diagram below for reference.

Comparison of the S351 and S390 balance shoes.