6 Fast and Simple Double Piston Extender Designs [Horizontal / Vertical] - YouTube
How to Build a SIMPLE Vertical Double Piston Extender - YouTube
I don't know if this has been posted before, but I was messing around and I built an extremely simple double piston extender | Minecraft, Post, Mess
Same double piston extender, different outcome. - Redstone, Commands and Mechanisms - Minecraft - Minecraft Forum - Minecraft Forum
The Worlds SMALLEST Double Piston Extenders (Minecraft 1.13+) - YouTube
Super small tileable double piston extender (horizontal) - Redstone Creations - Redstone Discussion and Mechanisms - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum
World's Most Compact Double, Triple and Quadruple Piston Extenders - Redstone Creations - Redstone Discussion and Mechanisms - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum
I made a compact double piston extender but it's not really that fast (hope no one already made this) : r/redstone
The Real Smallest Double Piston Extender : r/redstone
Super small tileable double piston extender (horizontal) - Redstone Creations - Redstone Discussion and Mechanisms - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum