Step 1: The Parts
You will need the following lego parts
Step 2: Getting Started
To make it easier you might want to lay the parts out like demonstrated in the pic. Slide the blue part (you may use a different color I'm using blue) up the rod
Step 3: The Hammer Part
Put the two red and two grey pieces together (again that's just the colors I'm using you can use any colors you want)
Step 4: Puting ItAll Together
Now just put all the pieces together. How simple is that!