Spinning lock cylinder

A landlord from Old Orchard Beach, Maine says:
I'm looking for a whole new door handle and lock or to figure out how to fix the spinning lock.
Here is the info I could find
Nami NFRC 100/200/500
H11-3-37
Series SVPD
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Bob from SWISCO responded:

Thanks for posting. If it's just the key lock that is damaged, you may be able to just replace it with a new one: see or 82-310 . You'll want to check first if the mortise lock is damaged. To do this, remove the handle set and attempt to throw the lock with a slotted screwdriver. If it doesn't budge, you'll have to replace it. See our 82-238 . For a new handle set that is keyed, see the 82-081

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