I have just purchased a new keyed alike set of euro cylinders (anti-pick, anti-bump, anti-snap) to replace the existing ones of unknown level of security.
I replaced 2 of them OK but the third (patio door) is causing problems.
If I put the new lock in place without the retaining screw, I can line things up OK and lock the door without a problem. When I put the retaining screw in, the lock is very difficult to turn and wont actualy lock.
Looking at the retaining screw when it has just started to be screwed in, it looks like its off centre to its hole. I think that tightening it up pulls the lock to the left slightly which puts the cam in the wrong position.
Also, comparing the width of the cam on the old lock to the new one, the new one looks slightly (maybe 1mm) wider than the old one.
Do cams come in different sizes?
Is it feasible to file the cam down to make it fit?