Hi All I replaced by flyscreen on my external security door it's an Austral lock , when I removed the handle to fit the new flyscreen I did not lock it and now something is not quite right because having difficulty locking it and the nib uses to.quickly lock the door from inside will not engage at all . I have taken the handle off and remove the cylinder, brought back to the lock position then reassemble but it's still not working, what Am I missing ?

