You're welcome for the lesson on the finer semantic details of your secondary language.
Bonus terminology:
"Appeal to authority": A logical fallacy in which it is claimed that a person's expertise in a field is proof of a claim itself. This is a disputed fallacy, as there are indeed certain instances where it might applicable, such as a mechanical engineer describing the workings of mechanical systems, but is always a fallacy when they attempt to use their expertise in one field as proof in another.
You can have a manual input to a mechanical system. For example, pulling a lever to operate a machine.
The typical distinction is whether it uses and translates the input through various mechanisms. Moving a shutter with your thumb is not a mechanical shutter.
Flipping a switch or pushing a button to do same thing could be. The manual input is translated to a separate output instead of the person providing the energy directly.
Did I explain this middle school vocabulary lesson to your satisfaction?