Injection

  Step 3 Pliers. Remove the back strap from your sandal. You should be able to do this easily by prying an edge of it up with pliers. Make sure that it is not glued down because you will probably have to move it around a bit during this step. If you are using a fixed loop like most people, just hold the strap with one hand and use pliers to loosen and tighten each loop on top of each other (the loops should go on top, not underneath each other). If you are using a ratchet style back strap then use pliers to unscrew it. Make sure that you read the instructions that come with your strap before you begin. Step 4 Tie a knot on the top of the loops with your string. Fix it onto the surface of the sandal and wrap string around all of them several times to attach it securely to each loop on top of each other. Tie a knot in string at the top and cut off the extra string. It should be tight enough to hold, but not too tight because this will cause blisters or chaffing from your sandals rubbing