CONSTANT FORCE COIL SASH BALANCE

A purchasing agent from Dartmouth , NOVA SCOTIA says:
I HAVE THIS COIL BALANCE, THAT IS STAMPED 7. IS IS A SINGLE BALANCE BUT THE COIL FITS RIGHT INTO THIS SHOE. I CANNOT FIND A SHOE THAT IS SIMILAR, AND I'M NOT SURE WHICH SHOE GOES WITH THIS TYPE OF COIL. THE SHOE WOULD MEASURE 1/2" THICK AND ABOUT 1 3/16 WIDE, IT IS ABOUT 1 1/2" LONG, BUT THAT ISN'T VITAL. MY COIL IS 1/2" THICK COIL. THE SASH WEIGHS ABOUT 14 LBS.

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Tom from SWISCO responded:

I'm afraid I don't recognize that shoe, either. That's quite unlike any of the shoes we have access to. If the coil and shoe are 1/2" thick, though, then we may be able to come up with a working substitute. 

Before I recommend anything, can you show me a picture of the pivot bar that goes into the shoe? Assuming we can find a substitute that fits in the track, we still need to be sure it can interact with the sash. The pivot bars are key to that. Let me know!

A purchasing agent from Dartmouth , NOVA SCOTIA says:
It is your 26-368 pivot bar
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Tom from SWISCO responded:

Thank you! Please give us a little more time to look into it. We'll get back to you as soon as we can.

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Paul from SWISCO responded:

Hi there and thank you for your patience with us. We believe the company that made this balance set up went of business. However, we do offer a similar set up. You can use our coil spring S160-7 as a replacement and for a new pivot shoe, our 15-191 is worth considering. It is shorter, but the width (1-1/4") and thickness (1/2" will match up with your measurements. As for the pivot bar, the 26-368 will fit in the metal center cam. Review both parts mentioned and let us know if any other questions come up.

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