Cut off the upper lip of a plastic bucket.
Cut a block to size based on the measurements of the battery pack for the clock component.
Trace the inside circle of the cut off piece of plastic bucket. Map out the center point of the circle on a piece of plywood, then drill a hole into the wood. This will allow the clock hands to be attached later on.
Hot glue the plastic mould to the plywood board.
Mix a concrete mixture together. Pour the concrete into the the mould. Place the wooden piece from Step 2 into the middle of the concrete with a screw.
Once the concrete has cured, use the drill to remove the screw from the concrete.
Drill all the way through the hole in the piece of concrete to create the space for the clock hands.
Place the battery pack for the clock in the back cutout in the clock piece.
Flip the clock over to the opposite side, then attach the clock hands.