Build a shield from an old satellite dish.
You'll need a knife, a wrench, some rope, a dish, and a marker.
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Step 1: The Dish
Take the dish off the rest of the unit. You will notice that there are holes in the dish. Don't try to patch these, they're perfect.
Step 2: The Handles
For this you'll need the rope. Start by feeding the rope through on of the holes and tie off the end. Then put the other end threw the whole next to it and tie near the hole and cut off the excess. Do the same to the other two holes. It may take a while to get the lengths of the handle and arm strap, but just keep playing with it till you get it right.
Step 3: The Chevron
Get a marker and put a Spartan chevron on the shield.