Screen Sliding Door Return Spring

A contractor from Anza says:
we have a 6' Pella door. Our spring for the screen door does not seem to be sprung, but it does not close the door anymore. Is the 86-021 the correct spring for that size door? And do you think we actually have a spring problem? Can't figure out any other way to tighten it to make the door close. Thanks, Karen
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Dave Sr. from SWISCO responded:
Your spring could have lost it's tension. Did you try to possibly shorten it? If not, you might need to replace it.
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