Hello, Am looking for1. sprial balance blue tip (photo attached) and2. Plastic anchor (circled red in second photo) where the screw goes inTotal window opening 59"×31. So, top and bottom sashes are 29"×29" each. Spring length in balance: 16". Tip to tip of balance: 29"Length of exposed metal tube in balance: 11.5"Diameter of metal tube: 3/8"Diameter of plastic around metal tube: 1/2"Total 24 windows
Can you please help identify the balance and the anchor?
Sprial balance and anchor
Quick Learner from Baltimore, MD
Aug 29, 2025 11:00 am
2 user uploaded images
6 Replies
Casey from SWISCO
Sep 4, 2025 9:09 am
Hello,
Your photos resemble the (3/8") S900 tilt window spiral balance, which matches the diameter of your plastic housing tube. There is a chart on the product page that explains how to choose your color option based on the weight of your window sash.
How to measure the tube length of the S900 spiral balance.
As for the plug in your jamb, take a look at the 26-200 screw plug. Review the measurements below to confirm it will fit the opening in your jamb liner. Thanks for posting!
Alternate image for 26-200
Quick Learner from Baltimore, MD
Sep 4, 2025 10:50 am
Thank you for the reply. Instructions for S900 say "When determining the length, only measure the metal tube".
However, in my case, there are two distinct sections (my first photo): top is metal tube section (12" long). And bottom is spring section (16" long). The spring encapsulates the metal tube for about 3/4" length and that is how spring is held onto the metal tube.
Can you please confirm that I need to measure only the metal tube length for ordering S900?
However, in my case, there are two distinct sections (my first photo): top is metal tube section (12" long). And bottom is spring section (16" long). The spring encapsulates the metal tube for about 3/4" length and that is how spring is held onto the metal tube.
Can you please confirm that I need to measure only the metal tube length for ordering S900?
Casey from SWISCO
Sep 4, 2025 11:14 am
The plastic housing tube of your original balance is broken. It should extend to just above the blue tip, covering the internal metal portion of the housing. You'll need to measure the entire housing, not including the spiral that extends from the bottom, to determine the correct length.
Quick Learner from Baltimore, MD
Sep 4, 2025 4:49 pm
Ok. If I understand you correctly, I should measure from the bottom of plastic housing in my photo upto the blue tip on top. I should NOT measure the metal tube inside the plastic housing. Am i correct?
Casey from SWISCO
Sep 5, 2025 8:29 am
If the outer tube is cracked off, we recommend using an identical window with an intact tube as a reference. The image below shows how to determine the length.
How to measure the tube length of the S900 spiral balance.
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