Marvin double hung tilt 1990

A handy person from San diego says:
July 19, 2021
I need to replace the balance tube on l and s sides of sash
At that time, they used a string instead of the metal spiral.
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Bob from SWISCO responded:
July 22, 2021

This looks like a Series 751 Ribbed Channel Balance. I'd like you to remove your old one and make sure the metal channel is 29" long. Also make sure the shoe resembles the one that comes attached to these balances, our 15-014. Please send a clear picture of it out of the window if it does not look the same. Finally, to know what stamp option to select, I advise obtaining the exact weight of the window sash. You can then match that exact weight with one of weight ranges listed alongisde each stamp option on the shop page.

For the pivot bars see our 26-150. 
Cam Pivot Pair
Cam Pivot Pair
26-150
$2.87
33" Series 751 Channel Balance
33" Series 751 Channel Balance
S751-33
$12.27
Balance knife lock Shoe
Balance knife lock Shoe
15-014
$1.09
Removing Rusted Pivot Bars
Removing Rusted Pivot Bars
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Anatomy of a tilt window
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How to install a ribbed tilt channel balance with knife lock shoe
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