Spiral balance weight (color) choice

A handy person from Blaine MN says:
Hi there. The spiral balancers I'd like to replace have no color, but I know are 29" and 3/8" dia. Would you be able to determine the weight/color needed by the size of the bottom sash? It measures roughly 44"x29" and is double pane. Thank you for any advice
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Bob from SWISCO responded:

Thanks for writing in. I'm afraid that the only way to reliably determine what color tip option you need is to weigh your window sash. You can then match that exact weight with one of the weight ranges listed alongside each color tip option on the product page. Let me know how you make out.

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