Paul from SWISCO responded:
March 9, 2017
Thanks for contacting us. Our customer service representative tells me that your balance is actually 35-1/2" long. Can you confirm? If it is, it will need to be custom made. Can you tell me how many you'll need? Once we know that, we can send you a price quote and custom order link.
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Paul from SWISCO responded:
March 10, 2017
I'm sorry, I'm not sure what you mean by "50 spring" and "40 spring." Can you specify? Are those stamps? If so, what is the complete stamp in each instance?
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Tom from SWISCO responded:
March 20, 2017
That stamp is actually a little weird. If it starts with "36," then it should be 36-1/2" long, not 35-1/2" long. If your metal channel is definitely 35-1/2" long, then we will need to know the weight of the sash that each type of balance supports. You will likely need a new spring strength calibration.
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