35" Spiral Balances

Quick Learner from Wilmington, NC
I want to replace the spiral coil springs in my MW windows (installed in 2000). The channel is 1 and 1/4 inch wide. The lower sash weighs 19 pounds. This is my second post to you today since some of my MW windows spring balances and others have spiral coil balances.
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Bob
Bob from SWISCO
SWISCO
Expert

The spiral balance might be either our S600-35 or S900-35, depending on the outer tube diameter. Compare both to your old balance and let me know what you think. 

Quick Learner from Wilmington, NC
Thanks for the info. My spiral balances are 3/8" so it the S900-35 look like the correct replacements. The windows (lower sash) weigh 18lbs therefore the white tips should work. These windows have not been raised or lowered very often. Do you think it is necessary to replace the pivot shoes?
Bob
Bob from SWISCO
SWISCO
Expert

If the pivot shoes are undamaged you should be able to reuse them just fine. Based on that information, the S900-35 with the white tip does sound correct to me. See the video below for removal and replacement details, and let me know if you have further questions. 

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