window sash assembly
A distributor from new hope says:
June 27, 2016
30 inch long. and one end screws through an eyelit to the side of the window
Paul from SWISCO responded:
June 29, 2016
We should be able to replace this. Can you just confirm the diameter of the outer tube? I'd wager it's 5/8" or 9/16". In both cases, I'd recommend our S600-30 spiral balance. Let me know what you think.