Minecraft wiki entry for Clock, associated text: A simple solution to this is to use a lever; flipping it on and then off 1 tick later. The most common method seems to be to place a redstone torch next to the clock, then quickly break it. This may take several attempts to do correctly, requiring the clock be broken and fixed between attempts. A more reliable method (shown right) is to place the torch on a powered block (a block of redstone, or any block powered by another torch or other power source) – the torch is on when placed, but turns off 1 tick later because it's attached to a powered block. The torch and powered block can then be removed, but stopping the clock later still requires breaking it.