I like to use all 3 bones in most of my calls. Just seperate the bones from the joints and cut them open in the biggest part you can to get the marrow out. hollow them out after boiling them for a while cleaning the holes and scraping the bells. I like to whiten my wing bones in peroxide like my wife uses for bleaching hair. Comes from the beauty supply shop and it is strong, like 65% I believe. Can't leave them in it long because it will eat away at the bone.