spiral balances mounting

A home owner from glenolden,pa. says:
I can get onenut plate at the top of the window frame that the balances screws into for mounting.i would like to know were I can get
one it a square nut plate.
I have been all over with no luck.
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Paul from SWISCO responded:
I'm not sure, but I believe you could be talking about our 26-200 screw plug. Check it out and see what you think.
How to install the 26-200 Screw Plug
How to install the 26-200 Screw Plug
VIDEO
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Modifying the Series 795 Balance
Modifying the Series 795 Balance
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