[Garth Herrick]

Now let's do the special tip of pulling out and tacking each corner to avoid those dreaded ripples. Put a tack on both sides of each corner. These may need to be removed and reset at the time when the rest of the tacks finally reach the corners from the centers.

With the corners pulled out, begin adding tacks out from each center tack, not more than two tacks out on ech side at a time. Keep flipping to the opposite sides and add the tacks even and orderly on every side.

Pay close attention to the tension on the pliers. If the pliers are pulled too hard, the ripple artifacts will be permanently added along the edge for an unprofessional finish. The pictures below explain this.