S385-29 for 47 pound window

A quick learner says:
29" Series 385 Channel Balance Product Code: S385-29 I need this balance to lift a 47 lb window. What would this cost and can you make this item?
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Tom from SWISCO responded:
That is an exceptionally heavy sash. I'm not sure if we can make an S385-29 that can support that kind of weight. Can you confirm that 47 pounds is the correct weight?
A quick learner says:
Old new air impac window. Yes we weighed this. It is 47 lbs.
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Paul from SWISCO responded:
In that case, can we see a few pictures of the balance itself? With a sash that heavy, you may not have our Series 385 and I just want to make absolutely sure. There are many balances that resemble our Series 385 but are larger, due to a heavier load. Since yours may have to be custom made anyway, it's important that we confirm. Thanks!
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