Is half a Euro cylinder lock practical in a patio door?

7 Jun 2015
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United Kingdom
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.
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You can get blanking plates that will secured with screws from the inside. Our new lift and slide patio door only has a lock on the inside by choice.

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