Quote:
Originally Posted by rwest
I’ve worked on mortise locks that had a single screw there that held the key cylinder from turning and falling out- maybe yours serve a similar function?
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Yes, many have 2 screws.
Quote:
Originally Posted by Don Plumley
Just down. It returns to the normal position easily.
Spoke with the customer service manage on Monday - he called me. It's a super-duper nice unit. Architectural-quality $tuff. He cautioned me about opening the mortise box as it has springs and ball bearings inside, they tend to explode out. The mortise box alone costs far more than a standard lockset 
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Loosen those 2 screws and make sure that lock cylinder is centered. Also, did you turn it in any? Sometimes you have to turn the LC out one full turn and set the screws. Same if too far out and it will go in one FT and not bind. I usually use the key itself to turn the cylinder. If it seems the key is getting too much strain and might break, it is. Don't go there.
Yeah, don't open it. The issue is 90% external. I've installed hundreds of these, all brands. PM me with specifics.