Paul , those locks need the keep to be adjusted quite loosely to prevent difficulty turning the key. They are such chunky locks that people with weakness in the hand and wrist sometimes find them very difficult to use.
Have a similar issue; door had solid spindle which I replaced with a split spindle so can only be opened from outside with a key, problem is that the key seems reluctant to turn now when trying to unlock, locking seems ok though. When the door is open the key turns easier, so could this be an issue with the keep needing adjustment or do i require a different euro cylinder? just moved in so happy to change that for security purposes anyway,
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