For this Diamond, you need 2 long lengths of 5mm (3/16") wooden dowel. At least 1.0DL (120cm, 48") each. They are easily cut to the length required with a small hack saw.
- Lay down a dowel over the center crease of the plastic. Mark it at the exact height of the sail, and cut off at the mark. Round off the tips with a wood file. This is the vertical spar.
- Cut off a very short length of dowel, 0.01DL (1.2cm, 1/2") in length. Round off the tips with a wood file. You can use thinner dowel than this if you have some laying around. This will be used as the bow-line toggle. I use 4mm dowel for toggles.
- Lay down some more dowel across the left and right corners of the sail, mark it at the exact width and cut off at the mark.
- Round off the tips with a wood file then add a bow-line so the depth of the bow is 0.08DL (9.6cm, 3 3/4"). With the kite flat on the ground, that's how far the tips should be off the grass. This is the horizontal spar. The photo above shows it with the toggle unattached, plus the vertical spar.