pella 4 ft wide sliding screen door

A home owner from anthony new mexico says:
we have a 1985 house with pella patio doors. the spring in the top of one door has stretched and lost tension to the point of sAGGING ON CLOSING AND obstructing the act of closing. it is probably a 3 1/2 or 4 ft spring origenally, do you have these? local pella store not real helpful. thanks for reply
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Paul from SWISCO responded:
We might be able to help. Check out our 86-021 and see if this is what you may have had originally. I can't be sure.
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86-021 : Pella Door Return Spring
86-021
Price: $19.98
Pella Door Return Spring