I need help with a 4x4 piston or flying machine door that comes out of the floor or walls it doesn't matter
I'm trying to find a four by four redstone door for 1.21.5 that is flush on both sides of the wall. I can't find any video tutorials showcasing one like this but every time I find a double sided flush door it's always a 3x3 which isn't what I need. It needs to be flush on both sides. Any help would be greatly appreciated!