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To create a spinning net shot the racket face needs to make contact underneath the shuttle and move across the base of the cork.
The aim should be to take the shuttle as early as possible with the arm stretched out. Finger and wrist movement create the spin rather than arm movement. In to out spin is usually used when a player has moved diagonally to the shuttle.
The racket head movement is from inside the court to out. For example for a right handed player the racket head movement will be from left to right to create the spin.