15 a fiberlux

A handy person says:
16" that the only information that a have
Thumbnail of the uploaded file named 1590633074488357355891975913851.jpg
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Bob from SWISCO responded:

Can you show me the nylon fitting on the other end of the balance as well? From there, we should be able to help. Many thanks. 

A handy person says:
Ok
Thumbnail of the uploaded file named 1591065235548675920959135676811.jpg
Thumbnail of the uploaded file named 15910652837527505510861369309142.jpg
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Tom from SWISCO responded:

Thanks for getting back to us! Bob's not here today but this is a pretty straightforward identification and I'm confident that I can help.

Based on your photos, I believe you have our S350-16. This has a 19-002 top fitting and 15-004 bottom fitting. As long as those match up then you should be good to go.

A handy person says:
Thank u Tom. Question what option 1510 1520 1530 1540 or 1550
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Tom from SWISCO responded:

Sure thing! Since your old stamp reads "15A," I recommend the 1510 option. The logic being A = 10, B = 20, C = 30, and so on.

A handy person says:
I still waiting for that model is no in stock.the 1510 You dont have right now. Can I used the S350-16 1520 option? I need the piece
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Tom from SWISCO responded:

I'm very sorry that the product you want is out of stock. Unfortunately, I don't think a stronger spring will work as well. Your window will be more difficult to close due to the extra tension and it could even drift up on its own, if the difference is too much. It's ultimately up to you, but I thought you should know the risks.

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