Could you always power pistons by pointing a repeater at the air above? I never noticed this before. : r/redstone
minecraft java edition - How can I get my redstone to activate adjacent pistons? - Arqade
minecraft java edition minecraft redstone - How can I make a piston expand on a delay, but contract immediately? - Arqade
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
Minecraft Redstone Basics: Flashing Lights, Pistons, and Repeaters - YouTube
Here's a compact sideways double piston extender(java) : r/redstone