Traco TR9100 single hung windows

A professional from Maryland says:
The TR9100 will not stay centered in jambs and then channel balance will not stay in place, then come up with window. Channel balance is not broken, springs are not worn. Could the nylon guides be worn?

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Manuela from SWISCO responded:

When you say, "TR9100", what piece are you actually referring to? Could we see a photo or two of the piece? maybe if we saw it installed, it would provide us with more information. 

A professional from Maryland says:
I can not show a picture of the channel balance. The problem is that the channel balance come unhooked from frame and travels up the jamb when you open window as the sash will not stay centered. I have attached pics I'd the channel balance.
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Tom from SWISCO responded:

This looks like a very heavy duty balance. This might have to be a special order. Your pictures are a start, but we need clearer photos of the top and bottom nylon fittings. I'd also like you to tell me the width, height, and length of the metal channel. Finally, please let me know how many you need.

Once we have that information, we'll do our best to track down a good match.

You also mention that the balances have come unhooked from the frame. That sounds like an issue with the top sash guide. Check the top two corners of your sash and see if the guides there are broken. The video below may also offer some insight.

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