Coil Balances, need several

A handy person from Virginia says:
February 10, 2024
I have several windows that need coil balances. The photos are from one of them. I tried a set of S140 5lb coil balances, but the bar on the bottom of the window doesn't fit into the window carrier part of the balance. Is there a different model that will fit the bulb on the end of that bar on the existing windows, or is the S140 the right part, but I need to get a replacement bottom bar? Other than the bar, the S140 fit in my window frame (though it was tight). Also, after I ordered, I got the window out and weighed it at approximately 13.5 pounds, does that mean I should use 5, 6, or 7lb balances?
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Paul from SWISCO responded:
February 10, 2024

Many thanks for writing in. It looks like you have the Series 140 Coil Balance system. For a sash that weighs 13.5 pounds, go with the S140-7 7 pound system, one for each side of the window. For the pivot bars, see our 26-398 and 26-405. Compare both with your old pivot bar and see if either matches what you need. Let us know what you find.

Alternate view of 26-398
Alternate view of 26-398
Detail of 26-398
Detail of 26-398
Alternate image for 26-405
Alternate image for 26-405
Alternate view of 26-405
Alternate view of 26-405
Alternate view of 26-405
Alternate view of 26-405
7 lb Series 140 Quick-Tilt, Single
7 lb Series 140 Quick-Tilt, Single
S140-07
$7.97
Rounded End Pivot Bar, 2-7/8"
Rounded End Pivot Bar, 2-7/8"
26-405
$1.72
Round End Pivot Bar, 2-1/2"
Round End Pivot Bar, 2-1/2"
26-398
$1.70
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