S900-30 spiral balance tip color

A quick learner from Bethlehem,PA says:
The original balances have a a white tip. What color would replace them ?
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Tom from SWISCO responded:
It really depends on the weight of your window sash. Remove the sash from the frame and place it on a scale to determine the weight. Then, compare that weight to the chart shown for the S900-30 to determine which Tip Color would be the best choice.
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