Allows you to craft saddles.
You need 3 leather, 6 iron nuggets and 2 string in total to make a saddle.
First, craft 2 hinges from the iron nuggets.
Then craft 2 leather straps from 2 leather (1 for each) and 2 string (1 for each).
Then craft a saddle from everything you have remaning (1 leather) and what you made (2 leather straps and 2 hinges).
You have now crafted a saddle!