Balances won't reattach, spring too strong?

A handy person from Los Angeles says:
I have non-tilt sliding windows with 27" channel balances (I think). They have been non-operational since I purchased my house and I dont have any knowledge of the make/model other than "IWC" logo on the latch.

I tried to re-attach the balances, but they won't stay attached. It feels like the springs are too strong for the weight of the window.

Can you please tell me which type/size balance I need for these. I have attached pictures of the measurement. I think it is the Series 351 Channel Balance listed on your site, but I want to make sure before I order.

Please give me a phone number to call you to discuss this part.

User submitted photos of a window balance.
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Paul from SWISCO responded:
Thanks for posting! I can't say if you have the Series 351 or not without knowing the depth of your shoes. Do you have the 15-001 or 15-002? Which is closer?
Alternate view of 15-001
As for the string being too strong, you may want to change what stamp your new balance has. What is the weight of the sash? That will help us determine the best possible match for your window.
A handy person from Los Angeles says:
Thanks for the response. If you look at the picture, it looks to me like it is 1", so the 15-002. The weight of the sash is 13.2 pounds when I use a scale. There are no markings on the window or channel, but I did find this label near the window after buying the house. I am not sure if this has any relevance for the window though.

Thanks again for the help
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Tom from SWISCO responded:
Great. Check out our Series 351 then. I think this could be a good match. You'll just need to determine the length of the channel. From there, you can compare the weight of 13.2 pounds to the option strengths shown in the chart.
A handy person from Los Angeles says:
I looked at the chart and the cut off is 9 to 13 pounds for the 2620 and then 13 to 19 pounds for the 2630. Which would you recommend if the weight of my sash is 13 pounds? What is the return policy if I want to exchange one for the other if it doesn't work?

Also, are all the "take out clips" the same length and diameter?

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Tom from SWISCO responded:
You said your sash weighed 13.2 pounds, so since it's over 13 pounds I'd go with a pair of balances with stamp 2620. This balance would use our 16-002 take out clip.

Finally, check out our Return Policy here.
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