Spring mechanism

A quick learner from Hope Mills, NC says:
Pat:5,353,548

Spring mechanism for a vinyl window
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A quick learner from Hope Mills, NC says:
Additional photos of type of coil spring I need.
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Emily from SWISCO responded:

Hello!

It appears your hardware is a match for our 15-087 which uses the Series 180 coil springs. Take a look and see what you think. To determine what coil weight option you'll need, check the band of the spring for a code. We've also related a video that will show you how to remove your hardware using the cutout method. 

A quick learner from Hope Mills, NC says:
On the spring there is a number 48 V or u. I'll need to get two sets and will need the expansion tool.
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Emily from SWISCO responded:

We carry the 75-069 jamb spreader set but we only recommend these to professionals who do this type of work often since they are quite expensive and not eligible to be returned. For homeowners, we recommend following the cutout method shown in the video below. 

The stamp on your spring doesn't match any of our weight options, however. If you could obtain the exact sash weight and tell us, we can calculate what coil weight you'll need from there. 

A quick learner from Hope Mills, NC says:
The windows are around 25 lbs.
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Tom from SWISCO responded:

Hey there! Emily isn't here today but I'll do my best to assist you from here.

The rule of thumb for weighing coil springs like this is to get the exact weight of the sash and then divide that by how many springs support it. In your case, you have two springs per side; for a 25 pound sash, that comes out to 6.25 pounds of support per spring, ideally.

Now, they don't make springs with quarter pound weights, so we will have to round down to 6 pounds per. That gives you 24 pounds of support, which should be perfectly fine assuming that your sash is indeed 25 pounds; on that note, I highly recommend that you get the exact weight. Estimations just aren't sufficient when it comes to this kind of hardware. Don't guess: remove the sash and place it on a scale to figure out precisely what you're dealing with.

A quick learner from Hope Mills, NC says:
I weighed the sash and it is 25lbs.
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Tom from SWISCO responded:

Thanks for verifying. In that case, I would suggest the 6 pound weight option for the Series 180 that Emily recommended.

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