[Garth Herrick]

Now being careful about the positioning of the canvas to the strechers, we may place the first tack in the center of the bar.

Next flip the canvas. Using pliers, establish the proper tension, and place the next tack in the middle of that bar.

Now do the remaining opposite sides with one tack each in the center, using the pliers to establish the desired tension.

Try to get a feel for an even tension each time, using the pliers.

Don't add more tacks out from the center until the corners are temporarily pulled tight in the next step.