DIY Advice - Door Lock

[PiKe]

My girlfriend wants to put a lock on her door to keep her nosey nephew and niece out of her room when she isn't in. I've taken the current handle off the door to check what kind of mechanism would fit, now I'm told this is an old style fitment and the only solution might be to drill the door below the handle and put a barrel lock in.

Is this correct or has anyone else got any suggestions?

https://dl.dropboxusercontent.com/u/29769115/IMG_20130701_160627.jpg

https://dl.dropboxusercontent.com/u/29769115/IMG_20130701_153939.jpg

 

[PiKe]

Go on admit it, this is a hump-lock

Well seeing as it only needs to be locked when shes not in the room, I'm not sure how your theory pans out...


Would a security bolt be suitable that you wind out with a key?

 

[PiKe]

I've decided to go for a biometric fingerprint scanner, thanks all.