On a 22 by 42β³ piece of canvas, stitch 1 1/2β³ hem on long sides & a 2β³ hem on short sides. Use 1/2β³ grommets, a hammer, and block of wood to drive 2 holes through hem on each short side, 4 1/2 inches from corners. Slip two 30β³ ropes through, & knot.