Removal and replacement of bathroom stall latch

A handy person from Bowie, MD says:
I am having trouble trying to install subject part. The part # is 10-557. I have tried using a C clamp to press the parts together,but they do not snap in place. I also need to know how to remove latches that do not work properly without damaging the door surface. Where can I find instructions for removal and installation of this part.

Thank you for your help.
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Tom from SWISCO responded:
Check out the video below. It's for a different part number, but the principle is the same. I hope this information helps.
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