Bathroom door lock condundrum

[Murmansk]

I was asked to replace someone's bathroom door handles and they provided a new set which have lever handles and a knob on the inside and knob turnable by a coin on the outside.

The problem is that the door does not contain any locking mechanism, only a standard tubular latch. I've seen bathroom door handles where the locking mechanism is such that the latch is disabled when you want to stop people coming in - but that's not the kind of handle they've bought.

The knobs for locking this door are supplied with a square shaft which has a slimmer profile than a standard one for a door knob.

Is it the case that this kind of setup really needs a specific mortise lock designed for a bathroom OR (I HOPE!) can you get just a mortise bolt with a smaller square shaft socket - a bit like one of those mortise bolts which have cross-shaped keys I guess?

[Max Demian]

Wouldn't it be easier to buy the right kind of handle for the lock they have, rather than replacing the lock? (I would have thought that handles cost less than locks.)

[Chris Hogg]

A picture might help, but I have what sounds like the same sort of lock on my bathroom door. Turning the knob on the inside through a quarter turn from horizontal to vertical stops the door handle from moving, so I presume something in the mechanism just obstructs the normal action of the handle.

[Brian Gaff]

Unless they are Brass of course, however if you cannot get the bits simply fit them a normal extra bolt on the inside. Brian

[Murmansk]

I've actually answered my own question - you can get them on Ebay

and it's far easier to fit one of these for £5 than a massive mortise lock

[Murmansk]

have, rather than replacing the lock? (I would have thought that handles cost less than locks.) <

They don't have a lock.

[Harry Bloomfield, Esq.]

Brian Gaff used his keyboard to write :

Which if its a decent door/house would not look very nice.

The handles the OP decribes, uses a normal sprung latch, plus an entirely separate rectangular locking bolt - I have one on my bathroom door.

[Steve Walker]

Just tell them to sing in the bathroom and everyone will know to keep out.

SteveW

[John Rumm]

You can get them combined into a single unit as well: