Double hung window

A quick learner from Forest, Virginia says:
The top double hung window has a plastic piece that fits into the bottom of the half inch"glide track." This plastic piece secures the round metal cup into which the window pin fits.
The markings on the window are HPC.
I need both the plastic piece and the cup.
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Bob from SWISCO responded:

This is called a T-Lock Shoe, which attaches to the bottom of a Series 795 Channel Balance. This shoe is either our 15-195 or 15-194, depending on the size. Watch the video below to see how to replace these T-Lock Shoes.

How to Install a T-Lock Shoe on a Channel Balance
How to Install a T-Lock Shoe on a Channel Balance
VIDEO
WATCH >
How to Convert a Crossbow Balance to a Channel Balance
How to Convert a Crossbow Balance to a Channel Balance
VIDEO
WATCH >
Modifying the Series 795 Balance
Modifying the Series 795 Balance
GUIDE
READ >
Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
GUIDE
READ >
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