Alcoa windows 4091, 1092 parts

A quick learner from Carmel Indiana says:
I have several Alcoa windows model number: 4091, 1092, the side sliding springs need to be replaced, can you guide me for the part information? Thanks.
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Paul from SWISCO responded:
I've known many Aloca windows to use our Series 600 spiral balance with a 15-046 shoe. I cannot say for sure if that's what you have, though, so I recommend that you carefully look over these parts and see how well they match your existing hardware. Let me know!
A quick learner says:
I have my windows contractor to check and measure the window parts over the weekend. He identified Series 900 spiral balances are what I need, I don't know whether the shoe is required or not as he didn't mentioned anything for the shoe. I have ordered the spiral balance without the shoe already. Please let me know if I need to order the shoe. Thanks.
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Paul from SWISCO responded:
You can reuse the shoe if your old one is undamaged. I don't know what condition yours is in, so give it a look to see if it's broken.

Just double check that you do have the Series 900 balance and not the Series 600. The difference is the diameter of the tube. If your tube diameter is 3/8", then stick with the Series 900. If it's 5/8" or 9/16", though, then you need the Series 600 instead.
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