Bilt-Well double hung window balances

A quick learner from Indianapolis, IN says:
I have Bilt-Well double hung windows circa 1962. Bilt-Well is now Eagle & part of Andersen. They have plastic balance boxes with the number 79 stamped on the end and measure 8" long, 3 1/4" wide and 1" high. Can you tell me which Andersen balance would replace the old Bilt-Well one, or if not what the Andersen balance sizes are and what loads (window weights) they're rated for.
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Paul from SWISCO responded:
The Andersen balance measures 6 3/8" long, 3" wide and 3/4" tall. We cannot guaranteed they will work. Respond with the weight of the sash so that I can match it up to the appropriate replacement Andersen balance.
A quick learner from Indianapolis, IN says:
The window weighs 23 pounds.
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Paul from SWISCO responded:
Before we begin making recommendations, can you please give us the top and bottom visible width and height of the glass?
A quick learner from Indianapolis, IN says:
Not sure why this matters but the top of each window has 2 rows with 4 panes of glass and the bottom has 3 rows of 4 panes each. The visible window (behind the moulding) is 42 7/8" wide. The glass (including the wood mounts) measures 39/38" wide.
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Paul from SWISCO responded:
You said the window weighs 23 lbs. Begin by taking a look at the 24-1231 Andersen Sash Balance. Now, this balance can hold an approximate weight of 24 lbs. (if two are used by a sash). Based on the information you've submitted, this could possibly work. Keep in mind, however, that this is for an Andersen window and may not work for your application.
A quick learner says:
Will try it...
A contractor from Indianapolis says:
I would like to know the outcome of the Indianapolis gentleman who tried the Andersen balances. I visited a home today that needs several bilt well balances replaced

Perry
A quick learner says:
The balances are thinner than the original but fit and work fine.
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