Constant force balance spring on Royal Prime window

Start a new Discussion

Quick Learner from Morristown, NJ

Dec 17, 2018 7:58 am

I need two constant force balance springs for a Royal Prime window. What part number do I need and where can I find it?

1 user uploaded image

8 Replies

Bob from SWISCO

Dec 17, 2018 8:36 am

Hello and thanks for contacting SWISCO. Because your pivot shoe looks like our 15-087, I believe you should take a look at our Series 180 balance springs; see if they match up with what you're looking for.

Quick Learner from Morristown, NJ

Dec 17, 2018 9:50 am

Thanks. Seems like they may do the trick. Any guidance on lb selection - there is an 8R stamped on the front of the housing. 8lb?

Bob from SWISCO

Dec 17, 2018 10:56 am

Yes, based on the stamp it is a reasonable guess that the S180-8 is what you're looking for. But to be 100% sure, you may want to weigh your window sash. If it weighs 16 pounds, then the S180-8 should be perfect, since it will be supporting 8 lbs per side (equaling 16 lbs total).

Bob from SWISCO

Mar 25, 2019 9:48 am

I do see the issue. Unfortunately, it looks like we sent you the wrong coil springs. We apologize for the error. We are going to send you out the correct springs along with a return label to have the incorrect ones sent back to us.

We thank you for your continued patience with us and we are working as diligently as possible to get this matter corrected for you.

Quick Learner from Morristown, NJ

Mar 25, 2019 10:26 am

I bought the S180-8 but the ones delivered were too wide for the sash channel (3/4" vs. .5"). Did I order the wrong ones? The picture on the website looks identical to the ones I need however the ones received look nothing like it. "408 J" is imprinted on the coil. Please help. I've added a photo. To the left is what was delivered, to the right is what I need.

1 user uploaded image

Quick Learner from Morristown, NJ

May 5, 2019 5:58 pm

My window's pivot bar doesn't fit the 15-087. There's a little bite out of the bottom of it. Do you have this type of pivot bar shoe?

2 user uploaded images

Tom from SWISCO

May 7, 2019 10:36 am

Ah, I've come across this problem before. In fact I just had a customer earlier today asking about this. You can still use our 15-087, but you'll need a new 26-040 pivot bar to replace your old one. I don't think this exact style shoe is made anymore (we haven't been able to track it down, anyway), but I've been told by many others who have tried it that using the 26-040 fixes the issue. Look it over and see what you think.