Ridiculous double extenders in all directions: Observer blocks | Minecraft | +Uma - YouTube
Super small tileable double piston extender (horizontal) - Redstone Creations - Redstone Discussion and Mechanisms - Minecraft: Java Edition - Minecraft Forum - Minecraft Forum
Horizontal Double piston extender Minecraft Map
minecraft java edition minecraft redstone - What is the most compact design of down-shifting double-pistons? - Arqade
Here's a compact sideways double piston extender(java) : r/redstone
need help with a horizontal double piston extender with block storage, use as much space as you want including down but the more compact the better : r/redstone