Window springs 29 3 FSI

Thanks for your post! This window balance is a match for either the S380-30 or the S385-30. To determine which of these is the correct replacement, you'll need to measure the depth of your bottom shoe.

Our 2930 stamp should work in place of the 29-3 stamp on your balances. A pair of these will support a sash weighing 16 to 23lbs.

Comparison of the S378, S380 and S385 balance shoes.