Inner Screen Door Latch

A home owner from Owens Cross Roads, AL says:
We have a screened-in porch. The screen door to the back yard has a door latch which has stopped latching. We've been working it, and concluded that the inner (smaller) mechanism has a spring in it which has failed. We see a marking on that inner latch which says PAT ID 3955839.
Do you have something which would get us all fixed up? Thank you. Photos attached.
Thumbnail of the uploaded file named Latch outside.jpg
Thumbnail of the uploaded file named Latch inside.jpg
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Casey from SWISCO responded:

Hello,

If you only need the inside latch, then you could consider the 40-117. Review the dimensions below to see if this would work for your repair. Thanks for posting! 

Alternate image for 40-117
Alternate image for 40-117

Underside view of 40-117
Underside view of 40-117

A home owner from Owens Cross Roads, AL says:
Casey, thanks for your reply. It appears to make sense for us to go ahead and get the entire latch set, not just the inside. Your 40-034 matches up fine with all the measurements your website shows.
With you having suggested that the 40-117 was the inside latch when we were looking for just that, do you see any reason why the 40-034 wouldn't work for the entire set?
Appreciate it.
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Casey from SWISCO responded:

As long as the dimensions shown on our product page match up to yours, I agree that the 40-034 would be a promising replacement option. Please let us know if you have any other questions. 

A home owner from Owens Cross Roads, AL says:
Thank you, Casey. Order placed!
How to flip a storm door mortise latch.
How to flip a storm door mortise latch.
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