Have just rekeyed two of these and I am having issue with key when used on one side only (entry from side without screw heads). The key teeth seem to be catching on the casing at the exit end (screw head side) and the curtain will not even move. Have to pull the key out slightly or pull key up for the curtain to move and then works ok. Casing plate does not seem bent. Anyone any ideas.
Sorry for bad focus on video: https://youtu.be/AwOYpNRYIJ4