Unique 16-D-40; 23-04-97

A home owner from Montana says:
Please provide a quote for your recommended replacement of the following balance:
Track length 17" width 9/16" height 5/8"
Unique 16-D-40 stamped on track, dated 23-04-97
Sash weight 26 lbs
4 required

Thanks
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Tom from SWISCO responded:

I think this balance has to be a custom order due to its configuration. What you have here is a plain channel balance for a tilt window, but with a 62-105 hook at the end of the cord, which isn't a stock combination

Before we go any further, can you confirm the weight of the sash? I think we can use our Series 770 as a substitute by tying the 62-105 hook to the end of the cord, but this uses a very different spring rating system compared to yours. I want to make sure that the spring can carry the right amount of weight before we commit to a custom order.

Please let me know if you can get that for me, or if you had any questions about my assessment. 

How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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