I sex them by their wing feathers and so far i have had what i think to be 100% accuracy. if they look like toothpicks with absolutly no "plumage" peaking through the shanks of their wings than it is a boy and if there is plumage or small strands of feathers peaking out it is a female. So far it has worked on all my chicks for the past 2 years.
Heres a link!
Heres a link!