Help needed please on re-stringing a Thomas Sanderson cellular window blind with the friction-fit knot system

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Hi,

The string broke on one of my window blinds. From doing some research, I think what I have is the Thomas Sanderson cellular window blind with the friction-fit knot system. It consists of two cords running through the blinds. They pull up and down from a grip on the bottom of the actual cellular blind, with tension holding them in place. The bottom frame piece has a tension spring (but no tension screw, it's just knotted). I haven't removed the top frame yet.

I have some 1.2mm string arriving soon.

Does anyone know how to rethread (most of the string pulled out so I don't know how it was threaded)?

Photos attached. Thanks for any help.
 

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