ActionScript 2.0 :: Delete Tweens After They Have Played?

Would it be a wise idea to delete tween objects once they have played?

Say I have one function that moves an MC across the stage to the right and another which moves the same MC back to the left. Should I remove each tween after it has reached the target?

Code:
function moveRight():Void{
var tweener:Tween = new Tween(MC, "_x", Strong.easeOut, 0, 500, 2, true);
tweener.onMotionFinished = function():Void{
delete tweener;
}
}