use binder clip as base and clip it to side the side of a desk or shelf. you can add a rubber band for added traction. then insert tower into binder clip and attach at bottom with rubber band.
Step 3: Crane arms
tie 2 pencils together with rubber bands. make 2.
Step 4: Joints
attach first arm to tower with tape. then attach second arm to first arm.
Step 5: Magnet/hook
tie rubber band around magnet as shown and tie string to rubber band as shown.( if you want to make a hook just unbend a paperclip to make the hook and tie it to a piece of string).
Step 6: Over the edge
Next take the magnet/hook and set it over the edge of the second arm.(if string gets caught you may need to place a piece of tape on the ends of the pencils to prevent string from getting caught. Note: if magnet is too heavy you may need to place a counter weight on the end of the first arm.