Mastic

Quick Learner
I have Mastic windows
I need two left side window spring balancers
2 left side spring balancers
4 screw plastic retainers
5 user uploaded images
4 Replies
Casey
Casey from SWISCO
SWISCO
Expert

Hello,

Take a look and compare the specifications of the S770 channel balance to yours, which comes with the 19-036 screw-way at the top. 

Close up view of the Series 770 balance top.
Close up view of the Series 770 balance top.

Close up view of the Series 770 balance bottom.
Close up view of the Series 770 balance bottom.

This balance is also often used with the 15-129 pivot shoe but you'll need to remove your part to confirm that the width and thickness match the measurements below. Thanks for posting! 

Detail of 15-129
Detail of 15-129

Quick Learner from Connecticut
Thank you for your response. How do you keep these windows working smoothly, and is there some recommended lubricants?
Casey
Casey from SWISCO
SWISCO
Expert

These balances do not generally require lubrication but you could spray some silicone spray in the jamb where they install if needed. 

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