Have you ever wanted to know how to have iron trapdoors stand up by themselves?
With this easy technique, your dreams come true.
Example below, I used the vertical trapdoors to look
like an air vent on a roof of one of my buildings.
First of all make this set up. It is pretty straight forwards.
When you step on the plate in front of the trapdoor, it holds it up.
Now shift yourself to the other plate, causing the piston to activate.
It will push the trapdoor to the side and keep it vertical,
even when you let go of the plate.
Tada! A Vertical Trapdoor without a signal.