Paul from SWISCO responded:
October 10, 2017
I'm having a hard time identifying what you have from this picture. Can you tell me if the window is tilt or non-tilt? Can you also Show me a picture of an undamaged balance? I would also like to know the diameter and length off the outer tube. Finally, please show me a picture of the bottom of the spiral itself. If we can see that on an undamaged balance, it would be ideal.
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Paul from SWISCO responded:
October 19, 2017
I am fairly confident that this is the Series 900. You should confirm the 3/8" tube diameter, since there is nothing in this style with a 1/2" tube. It should be 3/8" or 5/8", so measure carefully and choose.
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