This requires some waxed jointing floss, jointing needles both the same length (7") and two buttons.

Insert the needles in opposite directions, so you have eyes at both shoulders! .... (WHAT?) see the diagram.

Thread the needle on one side pull the floss through to the other side ( whatch for the needles, they are very sharp)

Unthread your needle and thread the second needle and pull through. Now tie the floss off.

The floss is very strong and because of the wax you only need to pass this through the body once it will not break and will hold the knot in place.