Tom from SWISCO responded:
April 24, 2017
Yes, that's correct. We have a chart on the S600-35 store page that tells you exactly how much weight each option can support. However, 50 pounds is exceptionally heavy. I'm not sure if we can make a version of this balance that can support that kind of weight. Can you confirm exactly how heavy the sash is? The S600-35 may not work for you.
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