Paul from SWISCO responded:
September 4, 2015
Hello, Mikhail. Were the balances that failed the same size and strength as the old balances? Did they happen to look different in any way, such as the shape of the nylon attachments or the location of the pulley wheels? Finally, do you have an old balance take a picture of? We would like to resolve this problem for you but will need more information about the old parts.
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Paul from SWISCO responded:
October 23, 2015
This is very peculiar. Especially now since the older balances are suddenly breaking at the same time. That seems very unlikely since they've been fine this whole time. There must be some external issue that is affecting them. Have your window sashes had their glass replaced at all recently? What is the weight of each sash? All your balances have the 2740 options, which can support sashes weighing 19 through 26 pounds.
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