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If you have a sliding patio door with a Euro cylinder lock in it, it probably opens from both sides. If you only wanted opening from the INSIDE, could you replace the cylinder with a half cylinder and blank off the outside hole? I'm thinking of this from a security perspective, so that there is no outside cylinder that might be attacked.

Realistically, the door can't be opened from the outside due to other locks anyway.

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    If you're only opening from the inside, why a lock at all? You want a simple dead-bolt actuator, since without a key there's no reason for a cylinder. – Carl Witthoft May 31 '16 at 15:35
  • @CarlWitthoft Err, what's a dead-bolt actuator? Is it electric? – Paul Uszak Jun 1 '16 at 21:40
  • No, just a simple lever or knob as on a typical keyed deadbolt. – Carl Witthoft Jun 2 '16 at 11:34
  • @CarlWitthoft Carl, it's a sliding door so I'm not sure how that could work. – Paul Uszak Jun 3 '16 at 12:41

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