Tom from SWISCO responded:
July 1, 2015
The Series 500 spiral balance and 17-012 bracket work very well together. In fact these two parts have been working together to repair wood windows since the 50's. However if your windows originally had the other two parts, you may want to stick with them. The original builders may have had their reasons for using that hardware and we cannot be sure if the 17-012 will work as well.
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