STEP 3A Take a projectile string and tie a square knot on one end. (A square knot is where you tie a knot in one direction then a second in the alternate)
STEP 3B Hang the square knot onto the hook and measure the appropriate length for the projectile to sit on the projectile rest. Once you have the length, tie a square knot onto the projectile. Trim the end.
STEP 3C In order to aim, bend the hook at a slight angle. Adjust the angle as you prefer in order to alter the trajectory.