Tom from SWISCO responded:
July 18, 2016
There are issues with going with stronger balances, actually. if the balance is too strong, it will become hard to close, and may even drift up once you close it. It's important to get the balance whose spring strength matches your sash weight; no more, no less. Think of it like Goldilock's porridge. If your old balances are hard to open, it's likely because they are old and the springs are shot. Most channel balances have a lifespan of 5-10 years, but this can be shortened if the windows are opened and closed frequently.
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Tom from SWISCO responded:
July 20, 2016
With a stamp of 1350, your balance should have been 14" long, not 17". Can you confirm the length of the metal channel? Don't worry about what's stamped on the window, only what's stamped on the balance itself. Usually markings on the window have no bearing on the balance used.
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Tom from SWISCO responded:
July 26, 2016
Thanks for confirming! I thought it might be 14" long. We can custom make two S385-14 balances for you with a special 1360 option. This can carry a sash weight of 15 through 18 pounds, which should be perfect for your sash. 1350 is definitely too weak. I will email you a custom order form for 2 of these balances, including a price quote.
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