Thanks for the info. I can measure and select. The sash weight is #23. I can go with a either a 3230 or 3240 for this weight. What is you recommendation?
If you sash is exactly 23 pounds without leaning to either side, then I guess you could go with either. Since your old balance used a spring weight that corresponds with our 3230 option, though, it may be best to stick with that.