Two posts and two Jacks.
Hi Littlejack - when I looked at ISSF I was surprised to find that it does not state 3 points of contact but rather it states that the elbow must be in contact with the knee + or - a measurement. If you try this then it's clear that the elbow is the root of the wobble. Competitors are allowed to fold their foot. As we allow forearm contact then I think it's fair that we do not allow folding of the foot.