I have a mortise lock and I just replaced it's dead bolt cylinder. I cannot find a perfect picture of it but it looks just like this:[url] In the middle there is a screw. I inserted it through the door and the mortise, insert the screw from the edge, tighten it, and try my key...won't turn. Let me rephrase, it will turn about once every 100 times I tried.
I removed it and took it back to the locksmith who keyed it for me, and while he watched, I can insert my key and it turns every single time. I felt like an idiot.
I then went back home, reinstalled it, and inserted my key, won't turn.
I removed it again and no problem.
So it will only work when uninstalled. Once I installed it fails.
I then removed the middle screw, it works again. WHAT IS WRONG WiTH THIS???? Why is the middle screw when tightened make it difficult to turn the key?
I looked closely, and it seems when the screw is tightened, I cannot insert my key 100% into the cylinder. There may be about 0.5mm still protruding, causing the problem.
I tried NOT tightening the screw too much and it did not help. I am running out of ideas. Why would this screw make a difference anyways? Is it possessed?