Replacement Channel Balance

Measure your bottom attachment. If you have the attachment shown below, then you need our S385-30 side-load balance, with the 19-005 top guide and the 15-004 (1-/32" depth) bottom fitting. Please compare your balance to this one to verify that it is what you need.

The spring weight for a 29-3 code is often equal to SWISCO's 2930. It's not a 100% guarantee, though, so you'd want to weigh your window sash and compare the weight to the "option" chart in the product description on the S385-30 product page. The chart lists which range of sash weights each option can handle.