to hold down ballest

A handy person from NY says:
August 3, 2021
2"long 1-1/8 top 5/8 deep top
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Dave Sr. from SWISCO responded:
August 6, 2021

Hello,

Take a look at our 18-046 top sash guide, along with the related videos on this page. This looks like the part you're looking for but compare our dimensions to yours and see what you think. 
Top Sash Guide, Storm Weather
Top Sash Guide, Storm Weather
18-046
$1.87
How to Repair a Jammed Window
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How to Replace a Top Sash Guide [1080p]
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