Missing spring

A handy person from New Jersey says:
I am missing one of these springs. It clips in the top of my sliding screen door and runs inside a tract. It is 4 1/8 inches long. The door is between 25 and 30 years old.
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Tom from SWISCO responded:

Hello! This looks just like our 86-012 tension spring. The length seems to match, too. Look it over and let me know what you think.

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