Replacement 30 inch balance rods

A home owner from Tustin california says:
I have 30 inch spiral non tilt balance rods that need replacing. No color tip. What do I need to purchase
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
It looks like you might have a special Series 900 spiral balance with a 15-073 shoe attached. We can custom make this for you, but before we can begin I will need to know the weight of the sash this balance supports. I would also like you to confirm the diameter of the outer tube, just in case. Finally, tell me how many you need.
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