The Worlds SMALLEST Double Piston Extenders (Minecraft 1.13+) - YouTube
Tile-able Double Piston Extender/Retracter - Redstone Discussion and Mechanisms - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum
Minecraft: Stylish 3x3 Spiral Piston Door Tutorial featuring a Downward Double Piston Extender - video Dailymotion
1-12 Piston Extenders [Redstone] | Minecraft PE Maps
Super small tileable double piston extender (horizontal) - Redstone Creations - Redstone Discussion and Mechanisms - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum
Mumbo Jumbo no Twitter: "Minecraft: How to Build Tiny Piston Extenders https://t.co/YVgMTx9x5E" / Twitter
1-12 Piston Extenders [Redstone] | Minecraft PE Maps