Marvin Tilt Pak Springs

A professional from Los Angeles says:

February 20, 2024

Hiya, I have a few Marvin Tilt Pak window track springs in need of replacement. They look a lot like the 750 and 795 series channel balances but the bottom (shoe??) is pictured. We have some 27" long stamped "26K" and another 21" long stamped "P20K"

thanks for your help!

Thumbnail of the uploaded file named Knife lock shoe

Casey from SWISCO responded:

February 21, 2024

Hello,

The knife lock shoe shown in your photo resembles part of the Series 751 channel balance, which uses the 15-014 shown below. Review the specifications of the shoe and confirm that the top of the balance uses a rivet for installation as shown below.

Close up view of the S751 balance top.

Close up view of the S751 balance shoe.

Dimensions for 15-014

As for your stamps, they do not match the strength options shown on the S751-21 and S751-27 product pages. Our balances can still work but you'll need to weigh the sashes that the balances support. There are charts under the S751 product descriptions that show the weight ranges that each option supports. Take a look and let us know if you have any other questions. Thank you!

27" Series 751 Channel Balance

S751-27

$11.63

21" Series 751 Channel Balance

S751-21

$10.56

Balance knife lock Shoe

15-014

$1.24

How to install a ribbed tilt channel balance with knife lock shoe

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Classifying Channel Balance Fittings

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