Window tackle balancer

Thanks for posting. See the S380-30 or S385-30. The only difference between these two balances is the depth of the bottom nylon shoe. See below. Measure your old balance's shoe depth to see what matches best.

Comparison of the S378, S380 and S385 balance shoes.

You have to choose a stamp option, which reflects the balance's strength. Your old balance's stamp of 29DS38 indicates the sash weighs 38 pounds. In that case, choose stamp 2965, since this will support a window sash in the weight range of 35 through 39 pounds.