Replacement constant force coil balance

See our 15-180 Pivot Shoe. This is compatible with our Series 190 Coil Springs. Does your window sash weigh 13 lbs? If so, then you could use a S190-740 7 lb spring on each side of the sash, for a total of 14 lbs of support (plus or minus 1 lb shouldn't make a difference). If you need new housing, see our 15-186 Balance Clip (for just one coil spring on each side of the sash) and 15-182 Balance Bushing.