Step 5Shuttles!
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This step is totally optional, but it makes weaving a whole lot quicker! Some people like using shuttles and others don't, so its your choice. A shuttle (in this case) is a piece of left over cardboard that is the same length as your loom. You use it like your plastic bags. Once you're done with a side and you flip your loom over to keep going, set your plastic aside and pick up your shuttle. Weave with it like you would with the plastic bag. Once you have it woven through turn it on its side and pull your plastic through! (I know that wasn't very clear, but it was the only way I could think of explaining it. Hopefully the pics will help.)