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Bob from SWISCO responded:
October 19, 2020
Is the metal channel, not including the nylon fittings, 27" long? If so, then you need either the S351-27 or S390-27. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. The picture below depicts this difference. If you have 26" long metal channels, then you'd want either the S351-26 or S390-26. You'll want to stick with the stamp options on the metal channels. Otherwise, the new balances will prove too strong or too weak for your window to function correctly. Unfortunately our supply chains have been a bit slower than usual this year, but these balances have been gradually trickling back into stock, so I don't believe you would need to wait long. Let me know if you have further questions. |
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Bob from SWISCO responded:
October 21, 2020
That stamp code just conforms to a stamp option of 2620; the B at the end is likely just some part of an old manufacturer code that isn't relevant for identification. The most important thing here is that 2620, usually seen on a 27" balance like the S380-27 or S385-27, indicates the balance is calibrated to support a weight range of 9 through 13 lbs. Hope that makes sense. |
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Bob from SWISCO responded:
October 21, 2020
Sorry, I shouldn't have used the Series 380 or Series 385 as examples. The S351-27 or S390-27 also can use the 2620 as a stamp option. Now, the more pressing issue is that the metal channels are only 26" long, not 27" long. What likely happened is that whoever installed the windows cut the balances down to size to fit your windows. You'll need to obtain the exact weight of the window sash. That exact weight can tell you what stamp option to select for the 26" long balances. |
