I plan to bury an ocean monument under sand.
To do this, I'll need a simple mechanism of a piston toggling fast, as I drop new sand blocks as it pushes them away, that way I get up to 12 blocks long, full ocean depth strip filled with sand. Then move the piston and its mechanism, and fill another strip, and another...
The part I need is clocking the piston to keep moving. Doesn't need to be elaborate - just the opposite, should be as simple as possible, to reduce the work needed moving the mechanism, and milk consumption (due to "mining fatigue under which I'll likely work.)
So - what simplest redstone circuit will make the piston toggle pretty fast?
(extra requirement, at least early on: circuit doesn't extend downwards below the piston; there will be water beneath the initial surface isle, the "block under lillypad" trick used to create the first "stepping stone", and a bucket of lava to expand it rapidly into a small floating isle. So the circuit may be flat or go up or sideways, but not down).