Minecraft wiki entry for Cobblestone_farming, associated text: Variation: Since the clock is already protruding, you might substitute a longer one to cut down on the piston noise. Experiment carefully with the delays, as some clock cycles can stop production entirely. (With this 5-clock, the generator is moving the pistons three times for every block.) Earliest Known Publication: May 29, 2012, Minecraft Smooth Stone Generator Tutorial by DJ&Riggaz.