Proper selection of channel balance

A quick learner from Copperopolis says:
July 15, 2017
Please help identifying the correct replacement. I'm not sure if it would be the S380 or the S395. And I find nothing on selecting the proper option?? Here are the numbers:
Weight: 18 lbs
Height(overall): 29 3/16
Width(overall): 34 1/4
Code: 26-4-JU-CMC-7
Mfr: Philips 2009
User submitted photos of a window balance.
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Tom from SWISCO responded:
July 20, 2017
The difference between the Series 380 and Series 395 is in the nylon caps on either end. The Series 380 comes with the 19-005 and 15-005, while the Series 395 comes with the 19-005 and 15-001. I don't think you have either, though. Yours looks more like our Series 385 which has the 19-005 and 15-004. Go over our dimensions to confirm.

The option is usually chosen by referencing the stamp. In your case, a 26 4 usually corresponds to our 2640. That said, you mentioned you have an 18 pound sash. Looking at the chart on the S385-27 store page, the 2640 would be too strong (it carries sashes weighing 19 through 26 pounds). If you are 100% sure the sash is 18 pounds, I recommend the 2630 option instead (13 through 19 pounds).
A quick learner from Copperopolis says:
July 20, 2017
Thanks Tom for your assistance. I went back and double checked the window weight on two electronic bathroom scales. Of course they didn't weigh the same(now I know which one to use for my diet!) and they came within a couple of pounds difference 16.8-18.3, both coming in within the 13-19 pound mark of the 2630 option. I am guessing my best bet is the 385-2630 unit.
If you agree I will order the 4 units I need.
Thanks again, Roger
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Tom from SWISCO responded:
July 25, 2017
If your sash weight is in that range, then I agree that the 2630 option would be the best choice.
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