MI Window Coil Balance part for Window Model 16350108.1, 380

A home owner from Los Angeles, CA says:
I would like to replace a broken coil balance part for my upper window sliding mechanism.
User submitted image of their window hardware.
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Paul from SWISCO responded:
Thanks for posting. The pivot shoe that operates with your upper sash appears to match our 15-180, which in turn matches our Series 190 coil spring. You will need the stamp printed on the original springs in order to identify the best match.
A quick learner from Los Angeles, CA says:
It appears that your coil balance shoe 15-180 is what I need to fix my window. The Coil has only a "4" stamp on it.
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Tom from SWISCO responded:
Great! If your spring reads "4," then I think you can go with our S190-440 balance. A good way to confirm is to weigh your sash, then divide that among your springs; each individual S190-440 spring can carry 4 pounds, so since you have four altogether in your window your sash should be 16 pounds.
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