Window ballast

A handy person from Indianapolis, Indiana says:
The whole tube is white and is 28 3/4? long with the spiral pushed inside.
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Casey from SWISCO responded:

Hello,

We'd be happy to help! We'll just need to know the length and diameter of the tube, as well as the tip color where the spiral comes out? Once we have this information we should be able to make a good recommendation. Thank you!

A handy person from Indianapolis says:
The white tube is 28 1/8 long and 1 inch diameter. There is no color tip as you can see from the photo, it is just the silver shaft.

Thx
Jim
A quick learner from Indiana says:
Diameter of the tube is either 3/8" or 5/8". Please confirm.
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Casey from SWISCO responded:

Please confirm the diameter of the tube, since it should be either 3/8" or 5/8". Also, you will need to remove and weigh your sash to determine which option you'll need. Thank you!

A handy person from Indianapolis says:
Please attached picture, the tip is a red or orange color and I put a ruler on the diameter.

Thank you,
Jim
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Casey from SWISCO responded:

I apologize, I should have been more clear. We'll need the diameter of the metal tube beneath the plastic tube. The white, plastic tube is a cover for the internal part of the spiral balance. If you could confirm that dimension, we should have everything we need to match you up with the correct balance. Thank you.  

A handy person from Indianapolis says:
The metal tube is 3/8 diameter.

Thx
Jim
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Casey from SWISCO responded:

By the looks of it, it seems like you'll need our S900-28 spiral balance. Please confirm the length of the metal tube, not including the spiral portion, to make sure you purchase the correct balance. 

Let me know if you have any more questions or concerns. 

How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
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