ellison windows

Thanks for contacting SWISCO. I think we can help you replace the coil springs; but the best way to do this is to identify the pivot shoe they attach to. Could you remove the pivot shoe from your window, take a picture of it, and provide the width and thickness? Identifying the pivot shoe lets us in turn identify the coil springs you need. If you need help removing your pivot shoe check out the method below. Thanks.

Well, I couldn't find an exact match for this pivot shoe but it is similar in size and design to our 15-228. Look it over and see if you agree. 

If so, then this shoe is compatible with our Series 160 coil spring. This is a 1/2" thick spring with a "T" at the end of the coil. You'll need the stamp on the old springs to confirm the best option. 

Let me know what you think!

Greetings. We believe the "S" represents the number 5, so use the S160-5 Coil Spring along with the 15-228 Pivot Shoe. You can double check this weighing your window sash on a bathroom scale. It should read approximately 10 lbs.

We couldn't find your exact support, but take a look at the 15-150S. It is compatible with the springs we recommended. Take a look and see what you think.

The coil spring is cradled inside the 15-150S; hence, it 'houses' the spring and acts as a support and cover. Let us know if you have any other questions!

Hm, that is rather unusual. Two 5 pound springs should certainly be good for a 10 pound sash. If it's still too weak, I would double check the sash weight just to be safe. You also could go up to a 6 pound spring, for a 12 pound sash, but keep in mind you don't want the coils to be too strong either.