Tom, You wont believe this but when I removed the sash to weigh it I removed the other balance(the one still working) and it had a different ID: 26 3 FR Caldwell. That number range a bell.
About a year ago you sourced a replacemment for that balance and I purchase a pair to replace another window in the house. Only one was bad so I saved the other old one. I located it and installed it in place of the one that is currently broken. It fit and works fine. So at the present time I do not need a replacement.
Thanks again for your assistance and if another one goes bad I will be back.
Regards and thanks again.
Joe
That's good to hear, Joe! Isn't it nice how some problems seem to almost fix themselves? Either way, please let me know if you have any questions in the future.