plastic glide

A home owner from Las Vegas says:
November 15, 2017
I have 1997 Milgard single hung windows. I am looking for a part that I would call a sash glide or spacer. They clip on the sides of the sash to keep the window tight in the frame as it slides up and down. Tiny, plastic or nylon, about 1/2" high. I need several. Surely must be a common replacement part but I haven't been able to locate.
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Tom from SWISCO responded:
November 16, 2017
I'm not totally sure what part you're referring to. All kinds of clips and guides can be used in the side of a hung window. Please send a photo of this part so we can start to research it a bit. I think we will probably recognize it when we see it.
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