The helicopter is a trick where you get the devilstick into a flat spin
using the handsticks. From an Idle position,
when the devilstick is in contact with the right handstick, give it a little
pull toward your body as you toss it to your left hand. Then when it is
in contact with the left handstick give it a little push away from your body.
This pulling and pushing will start causing the devilstick to get into a flat
spin, the helicopter. It might also help to angle the right handstick up a
little and the left one down a little. This will also cause the devilstick
to roll a bit on the handsticks, which helps with the helicopter spin.
Be sure to work on doing the helicopter in the clockwise and
counterclockwise spins.