Balance spring

Question

Balance sash spring they do not stay in place seems like missing clips to keep them in track

Bob · Accepted Answer

Thanks for posting. This might be the S378-21, S380-21, or S385-21, depending on the shoe depth. See the chart below. Measure your old balance's shoe depth to see what matches best. For a stamp option, your old stamp of 20-9 is from an outmoded rating system. Weigh the window sash. You can use that exact weight to choose the right stamp option.

Comparison of the S378, S380 and S385 balance shoes.