How to get String

String(bit) can be found in Grand Glade. To find it, go onto a quest, and then onto the map. On the map there are some caves on the bottom left corner. Look to the right of the largest cave. On the right of the largest cave is a small cave which has string in it. To get the string you need to be able to make 2 quest gadgets(frog and pickaxe). I hope this helps you!