Sliding glass door lock/handle set

A quick learner from Mississippi says:
I would like to have a lock on my door that has a key, so I can get inside from the outside when the door is locked. This is an old door with no identifying marks or numbers of any kind. The door is 1 1/16" to 1 1/8" thick (I can't see that well). It looks like the screws attaching the whole thing are very close to 4" apart. Can you help me?
Kathy
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Bob from SWISCO responded:

Take a look at our 82-033 and 82-218. I believe this is what you need.

A quick learner from Mississippi says:

Thank you very much! Thank you for the direction, but is 82-218 a keyed lock? I would like to get in from outside with a key.

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Bob from SWISCO responded:

Hey Kathy. The mortise lock itself actually doesn't determine if the door is keyed or not; the outside pull does. What I'd consider doing is buying our 82-044 Outside Pull as well as the 82-315 Key Lock & Housing. The video below shows how to adapt these two parts. 

How to install the Swisco 82-033 Handle Set
How to install the Swisco 82-033 Handle Set
VIDEO
WATCH >
How to install a Legacy Handle Set
How to install a Legacy Handle Set
VIDEO
WATCH >
How to install the 82-218 Mortise Lock
How to install the 82-218 Mortise Lock
VIDEO
WATCH >
How to Install a Key Lock on a Patio Door
How to Install a Key Lock on a Patio Door
VIDEO
WATCH >
How to maintain a sliding glass door
How to maintain a sliding glass door
GUIDE
READ >
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