FOR SCHALLER LOCKING TUNERS:
After removing the old string, loosen the thumbwheel screw in the back of the tuner of the string you are going to change. Run the string through the bridge and all the way up to the correct tuner. Re-tighten the thumbwheel screw to secure the string in the tuner post. With a good pair of wire cutters, cut the excess string. Tune the string to pitch. It is ideal to have less than one full wrap of the string around the tuner post when tuned to pitch.
FOR DOUBLE LOCKING TREMOLOS:
When replacing a string on a guitar with a double locking tremolo, it is very important that the bridge should sit parallel to the body so as not to damage the finish. It is recommended to change strings one or two at a time; certainly leave tension on one string while changing the rest. Place a soft towel or cloth under the back of the bridge to protect the finish.
Care must be taken not to over-tighten the saddle clamps. Push new strings through the saddle first with the ball end toward the nut so that you may fish the ball end under the string retainer to avoid damaging the finish. Strings should come off of the retainer toward the nut to assure that the string is touching the entire surface of the nut in order to keep the string from changing pitch when installing the nut clamp. You are now ready to tighten the strings at each end.