What is the purpose of hte 19-029 S clip?

A handy person from Mich says:
May 26, 2011
Whawt is the purpose of the S-Clip? To what does it attach?
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Paul from SWISCO responded:
May 28, 2011
The 19-029 and 19-030 S-clips attaches the sash support balance to the top of window track or frame.
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