If you've ever needed to draw a perfect circle freehand, you've probably figured out that it's pretty tough to do. How will you make some of the other cool things powered by rubber bands that we've ...

a piece of cardboard, 25x30 cm, • a pencil, • a wall-paper knife, • glue, • a good quality rubber-band, • a screw, • a ...

You can draw perfect circles of all sizes with a ... But you can also make an impromptu compass with three pencils and a rubber band, a strip of cardboard, a piece of string, or use two pencils ...