27 4 JT CMC 4

Quick Learner from Arcadia, Callifornia

I don't know which track to use. My wife does not have a lot of upper arm strength. There was only one track to be found. The track is 28 not including the plastic ends. The track is 1/2" and flares out to 5/8" on the bottom. I also need the clip to attach the track to the window sill.

Please forgive my misuse of the terminology.

Thanks for your help.

Bill

4 Replies
Tom
Tom from SWISCO
SWISCO
Expert

I'm not sure what you have, unfortunately. We have dozens of different balances with that stamp. It's not a product code or anything, it just indicates the strength of the spring.

In order to figure out what Series this is, I need you to remove an undamaged version of this balance from the window and show me clear pictures of the top and bottom nylon fittings. I will also need to know the dimensions of these fittings.

Quick Learner from Arcadia, Callifornia
Here's the uploaded pictures.
4 user uploaded images
Tom
Tom from SWISCO
SWISCO
Expert

Thanks! Based on what I see here, you have either our S351-28 or S390-28, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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