If your stave is green,you can build a simple form to shape the reflex your wanting,then,rough out your bow to the floor tiller stage,then clamp it to the form.Leave it on the form a month,then remove,then put it in a warm dry place for a few weeks.Weigh it on a digital scale ,then repeat every couple of days until the weight stabilizes.When it has reached equilibrium,you can finish tillering.A drying box will speed the process up even more.I have built elm bows that hold reflex,just 2 months after felling the tree,and that's without a drying box. If your stave is already dry,you could try dry heat for your reflex.I've had good success with it,but use oil (vegg.oil or bacon drippings)on the area to heat.If you are going for recurved tips,then steam or boil,just be sure to put a good coat of shellac on the area intended to heat.One more thing ,if the stave is dry and tillered to brace height,you can clamp it down on the same simple form previously mentioned,then heat treat the limbs in reflex. JMHO God Bless