Dave Sr. from SWISCO responded:
January 5, 2016
To remove the key cylinder from this kind of Atrium door lock set, you will first need to remove the set screw on the edge of the door. That set screw should be the second one up from the bottom of the lock edge. Remove the screw completely from the lock, then turn the inside thumb turn so that the lock activators are in line. The key cylinder should then slide out of the lock.
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Dave Sr. from SWISCO responded:
January 7, 2016
Ah, I see. I apologize for the confusion. Your original post was cut off so I didn't know you had already tried this method. That's really the only way, though. I can't think of any tricks beyond what we've gone over already. You may want to contact a local locksmith for further assistance. That's probably your best bet now if the cylinder is stuck, and especially if you don't have the original key.
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