See this video for YRL216, YRL236, YRL256 (Yale Lever Lock in Assure family of models)
See this video for YRL220 (Yale Lever Lock in Real Living family of models)
There are a few crucial steps to remember when installing a Yale Touchscreen Lever Lock.
If you incorrectly determine the handing for the blunger, the door will not be able to close.
Tailpiece position and orientation are crucial for the lock to not fail.
Lever position is incredibly important. If the handles are installed incorrectly, the lock will not function properly. There will be no way to lock it. In other words, if you lift the handle upwards when it is locked, the door will open. Here's how to test the lock.