Paul from SWISCO responded:
May 30, 2012
Thanks for posting! For many channel balances, the first two numbers of the stamp are one digit less than its length. There are exceptions of course, but traditionally that is the case. A stamp of 20 on a 21" Series 751 balance makes sense. However, do you have any other letters or markings on your stamp? Does it only say 20?
If there are no other markings, we will need to know the weight of your sash. This will help us determine the appropriate option for you to select. Also, you may want to look at our 19-030 Long S-clip. That looks like it may match your top clip. |
Paul from SWISCO responded:
May 30, 2012
Unfortunately, the only way to determine your sash weight is to remove it from your window and weight it on a scale.
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Paul from SWISCO responded:
June 18, 2012
Thanks for getting back to us! I recommend that you select the 20R stamp option. Two S751-21 channel balances with the 20R stamp option can carry a window sash weight of 10 through and including 17 pounds.
Please keep in mind that the weight range capacity information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate. |
Paul from SWISCO responded:
June 25, 2012
Great news! I'm glad everything worked out.
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