Can someone please explain how this would work?

cylinder - part takes key , turns. works in conjunction lock. cylinders brand-specific. in other words, use schlage cylinder schlage lock.

if mean 'a normal bedroom door normal handle' passage set, or un-keyed doorknob, can locking passage set (doorknob takes key) replace (see link). remove door , take hardware store. again note lock parts brand-specific. doorknob has paired same brand - , model - latch.

http://www.amazon.com/kwikset-400t-smt-6al-rcs/dp/b0036bqbqm/ref=sr_1_4?s=hi&ie=utf8&qid=1361386916&sr=1-4&keywords=keyed+passage+set

http://www.wickes.co.uk/invt/521038
it's lock door. want outside of door. don't know how work looks simple , cheap. i've got normal bedroom door normal handle.

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