When you weave using many colour yarns, you might want to prepare as many shuttles as your yarns. But shuttles are not very cheap. Then I found an easy way to make spare ones with aluminum wire. The type of aluminum wire I used is 2mm diameter and it is very easy to change its shape. I only used a pair of pliers/nippers to cut the wire and I could bend it easily with hand.
I hope it helps for some people :)