Clamp the bow in a vice at exact the point where the limb needs bent. Hang a 1 gallon jug of water, or some king of weight, off your tip with the side it needs bent to facing down. Then take a tape measure and measure from the floor up to the top of the tip. Leave the tape measure sitting there, you may have to prop it up with something. Then use a heat gun and heat the back and belly of the area just outside the edge of the vice. Stay about 4 to 6 inches away from the wood as not to scorch it. Pretty soon, about 3 or 4 minutes, you will see the tip start to bend down. Keep an eye on the tape measure and when it gets close to where you think it should be, stop the heat. Let it sit till it is cool.