Piston push stone generator farm

A small stone generator for a survival world. Lava flows onto water and turns into stone along two rows, and a row of hoppers carries the drops into chests. Pistons on a repeater clock push you left and right along the rows, so you mine without moving. Use a Silk Touch pickaxe for stone, a plain one gives cobblestone; the video mines with a fast pickaxe and Haste from a beacon. It is a generator, not an automatic farm: every block is mined by you, so it only runs while you hold attack.

• Add one delay to each repeater behind the pistons, the timing in the video no longer works. Tune until both pistons fire together. Top comment on the video, 830 likes.
• Use a stone button, a wooden one keeps the signal on too long and the pistons fall out of step. 92 likes, several builders report it.
• If the clock fires once and stops, break the button right after pressing it. Two builders say so.
• Replace the two front trapdoors with stone buttons if you keep catching fire, fire spreads through the spruce trapdoors. 234 likes.
• Keep the row of hoppers, a water stream instead lets the drops burn. Several builders still lose some drops to the lava. 144 likes.
• Mine with a Silk Touch pickaxe for stone, a plain pickaxe gives cobblestone. Several builders say so.