As of late I've been using these lock tweezers for delicate soldering jobs. A normal spring tweezer has too much tension, which tends to deform thin metal when it is hot. With these locking tweezers the tension can be adjusted – very, very gently if need be. I bend the tip like a spring tweezer. You can find these at jewelry tool suppliers called gem locking tweezers. They are generally of better quality and thus last a long time.