Searching for Bsi 21hd

A quick learner says:
May 15, 2021
Good afternoon - I have several broken BSI window balances at my house, where there is no tension to keep the windows up. I am trying to replace these parts and need to identify how to determine what part and how to remove the old ones. I have no idea what kind of vinyl windows I have, they are approx 20 years old and no identification on them. The inner balance has 21HD and the outer balance has 19HD. Any information would be great! Thanks in advance!
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Emily from SWISCO responded:
May 17, 2021

Hello!

We'd be happy to help but we'll need you to remove an undamaged balance with the end attachments intact to compare to our inventory. You may find the video below helpful, it explains how to replace channel balances in a non-tilt window. 
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