Need Help Identifying part

A home owner from New Mexico says:
July 30, 2018
I would like to know the part name to the part that holds the top part of the sash in place, and it has 1 screw only, it is like a cover plate for the sash.
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Tom from SWISCO responded:
August 6, 2018

I'm not sure exactly what it is you need. Could you show me a picture of the part in question?
28" Series 900 Spiral Balance
28" Series 900 Spiral Balance
S900-28
$9.10
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