Tile-able double Piston extender, Now up, down, and sideways, also they're flush! - Redstone Discussion and Mechanisms - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum
Double Piston Extender That You Can't Bug! - Redstone Discussion and Mechanisms - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum
Upside Down Vertical Double Piston Extender - YouTube
Downward Double Piston Extender, it works but I don't understand why. Any explanation? - Redstone Discussion and Mechanisms - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum
Even Better Downward Flush Double Piston Extender - YouTube