Spiral balance for tilting double hung Great Lakes windows

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Casey from SWISCO responded:

Hello,

We'd be happy to help but we will need to know the diameter of the spiral balance tube, as well as a picture of the entire balance removed from the window. Thank you!

A quick learner says:
The body is 21" long and the tip is red. I need 6 spiral balances if available.
Thank you
A quick learner says:
I also need the plastic square screw anchor shown in photo
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Tom from SWISCO responded:

Thank you! The square anchor is similar to our 26-200, which is 1/4" square. Look it over and see if you agree.

It's tough to make out the diameter from this photo. It looks like it's about 9/16", which would make our Series 600 a good match. You should double check to be sure, though. Just a picture of a tape measure can be difficult to eyeball.

A quick learner says:
Yes it is 9/16. Sorry i intended to write that but didn't
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Tom from SWISCO responded:

Not a problem! Happens to me all the time. At 9/16" then I think our Red Tip S600-21 is our best match.

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