Door mechanism

A quick learner says:
Latch to lock, turning left and right, takes great strength to turn. Need to identify way to fix.
Thumbnail of the uploaded file named IMG_9843.jpeg
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Casey from SWISCO responded:

Hello,

Your photo resembles the mortise lock used with the 82-400 Atrium lever lockset shown below. Take a look and compare the dimensions to your assembly to confirm if it would work for your repair. Thanks for posting! 

Alternate image for 82-400
Alternate image for 82-400

Dimensions for 82-400
Dimensions for 82-400

A quick learner from Knoxville TN says:
Your information was so helpful! We took entire lock box apart, used machine oil and voila', the thumb latch moves like butter. Spring controlling door latch is broken and no idea where to order a part. Any advice would be so appreciated.
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Casey from SWISCO responded:

Unfortunately, the internal spring for this assembly is not available separately. We apologize for the inconvenience. 

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