DSI 28 Replacement balance

A handy person from Kingston, NH says:
This balance assembly came from my Silverline vinyl, double-hung, tilt sash windows that were installed in 1989. Where can I find replacement parts for these?
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Casey from SWISCO responded:

Hello,

Take a look and compare the specifications of the S775-28 channel balance to your assembly. Thanks for posting! 

A quick learner from PA says:
Do you have a close up view of the S775 shoe. Also, where do you take the measurement of the shoe to determine if it's 1" or 1 1/4"?

Thanks,
Gary
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Casey from SWISCO responded:

Sure, see a photo of the S775 shoe below. You would measure the width straight across the hook.

Close up view of the bottom of the Series 775 sash support balance.
Close up view of the bottom of the Series 775 sash support balance.
 

How to install a S775 balance
How to install a S775 balance
GUIDE
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