Trouble with 40-192 lock

A home owner from Parrish, Fl says:
I just received my 40-192. The lock fits great. However, we can't operate the dead bolt from the inside unless the key is inserted and turned slightly.
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Dave Sr. from SWISCO responded:
I'm not sure where the problem is. There might be a slight "burr" somewhere in the lock or key cylinder. I suggest removing the lock set from the door and trying each part separately to see if you can zero in on the source of the problem. Also you might want to try some lubricant like graphite to loosen up the lock.
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