Take the skewers and force one through the thigh perpendicular to bone and just above drumstick, into the breast, and out through the middle joint of the wing. (fieryfoodscentral.com)
Then shift your right hand down until your right fingernail lines up with your left finger's middle joint — your two scores are the entire length of your index fingers. (theperfectloaf.com)
One begins at the arm's tip and another at the body; where the waves meet determines the position of the middle joint. (sciencemag.org)