Sliding glass door
Hello there. If just the key lock cylinder is missing, you might be able to replace it with our 82-310. The guide below explains how to install this sort of lock for a different, but similar, handle set. Check it out. Alternatively, if you just wanted to replace the entire handle set with a new, keyed version, see the 82-030A.
You may want to check to make sure the mortise lock in the door still works. To do this, remove the handle set and try manually 'throwing' the lock with a slotted screwdriver. If it doesn't budge, you know it needs to be replaced. See if the 82-227 matches what you have. Let me know if you have further questions.
Great to hear! Thanks for letting us know, and reach out if you ever have other hardware-related questions.