Just bend the affected part of the limb, usually near the recurve/tip, in the opposite direction, unstrung, of course. Need to bend it quite a bit further in the opposite direction to account for springback. Often that is enough. Sometimes, it won't take, and you'll need to apply heat. Warm the affected/warped area with a hair dryer until it's quite hot to the touch, then bend it again and hold it until the limb cools. Wear gloves when you work with a hot limb. Also, you should know, that applying heat can cause the limb to delaminate. Actually, sometimes just bending the limb hard in the opposite direction of the twist can cause it to delaminate, a result of the glue/adhesive breaking down due to age. That's the chance one takes when straightening limbs. Most times it works though. Good luck. Oh yeah. After you get the limbs straight, use a stringer.