Take a pipe, 1.5 - 2 inch. Cut it in half down the middle so it looks like half of an "o". Put that on a long pipe and push the paintballs to the outside of the field!
Ok here's some pics to understand. Sorry for the bad iPad drawings.
1) Get the 3/4 to an inch pipe, and cut it like this down the dotted line
When done, it should look like this
It can be however long you want. I would keep it under 3ft so you can move it around the bunkers.
3) Take an uncut pipe and nail or superglue it to the middle of the cut pipe, making sure it is not only in the middle lengthwise, but right on top of the curve. This will be your "broomstick handle" so cut it according to height.
4) Push the paintballs out to the side of the field!