Tom from SWISCO responded:
June 28, 2016
Thank you for posting, may we see the balance nylon ends and clip attached to the cord to better assist you. Also, do you know the sash weight?
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Tom from SWISCO responded:
June 30, 2016
Thank you. This looks like our Series 390 channel balance, based on the pictures. I'm afraid we will need to know the weight of the sash in order to recommend the best option. Yours ends in 9, which is a rating system no longer used by modern manufacturers. One of our standard options could still work, but I will need to know the sash weight to confirm which.
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Tom from SWISCO responded:
July 8, 2016
The exact sash weight is very important. If your balance is too weak, it won't hold the sash up. If it's too strong, you won't be able to close it. We do not recommend estimating the weight of your sash, as being even a couple pounds off can lead to having a balance that doesn't work properly. Our philosophy is that it's better to be safe than to be sorry.
Like I mentioned, your stamp uses an old rating system that is no longer in use in the industry. That's not to say that one of our stamp options can't work, but I cannot confirm which one is the best option. The manufacturer who made your balance changed how they calibrate their springs and so we have no reference for your old version. Fortunately, we have a chart on the S390-33 store page that lists every option available for this balance and how much weight they can support. All you need to do is place your sash on a scale (any bathroom scale should do) and refer to the chart. That will tell you exactly what you need. |