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Edited.
There's tools for removing snapped keys.
Thin wires with barbs cut into them>>
Broken key extractor set https://amzn.eu/d/0bCMOdbTo remove the key, you need to orientate the key into the broken key into the position where it can normally be inserted and removed.
To replace the cylinder, you'll need to get the cam aligned with the bottom of the cylinder cuttout, to allow you to withdraw the cylinder. That's normally done by turning the key about 15 degrees turned one way or the other.
You'll also need to remove the retaining screw which is accessed through the hole in the faceplate... when the faceplate is in the correct place, as I assume it still moves up/down when the handle lever is moved.Doors that are difficult to lock are often caused by the door being out of adjustment with the frame. So, one or more of the locking points can't travel quite far enough without it bottoming out in the keep. At which point you're lifting or pulling the door into place with the locking mechanism before you can turn the key.
Being a sliding door, I'd guess the bottom rollers need a slight adjustment to raise the door. Or one roller needs adjustment to get the side of the door equally aligned with the side of the frame. Looks like there's also packers available to shim the keeps.
https://www.gfdhomes.co.uk/downloads/cortizo/cortizo-install-guide.pdf
user69121-
Got the cylinder out no problem. Finding a suitable replacement seems to be more of an issue!
It seems to be a hard to find size. I might give the key removal tools a go if I can't find a replacement but I'm keen to get it lockable asap. I'm wedging it shut with an offcut of skirting at the moment!
I'll look into adjusting the rollers, I hadn't thought of that. It's definitely catching on one of the keeps.
Trunkie
Nah it’s well and truly in there. New cylinder time. So, in addition to my original question about adjusting the damn thing, anyone know how to go about swapping the cylinder?
The most fun part about all of this is that I put my front door on the latch on Monday while I got something from the car, the wind slammed the door and the force jammed the lock. I took it apart and released it but now it doesn’t quite click into the jamb like it used to. My house is currently as secure as a crisp packet.