well, i've built a few osage bows, ( over 400 ) and i use steam , just a big pot on a hot plate with a piece of aluminum foil over it for 30 or 40 min. for short section , or i've got a stainless 4 in pipe , capped bottom , put a rock in bottom , about 4 in. of water , bring to full boil . pipe is 3 ft. tall steam whole bow limb at a time . get vise ready , good pair of gloves , gerk bow out , clamp hamdle in padded jaws , bend limb past point needed and ease back to where it needs to be and hold for a good while. makes perminate bend . if it needs to tweek a spot , i have used an old coffee pot , same manner . tony bell