HootOwlDude
Tele-Afflicted
I always stretch, pretty aggressively, twice, all the way down the string, every three inches or so, tugging with my thumb holding the string stable while my forefinger pulls up, pretty hard. You can actually feel the string tensing and stretching. Do that to all strings, almost to the point where maybe you might break the thing, and—by my experience—you’re golden. The string will hold tune like they’re broken in. I effin love that sound when I install a fresh set and all is stable and full and bright. On my electrics, it’s Diaddario (sp??) 11s, across (almost) all guitars. The regular ones, no fancy all-nickel or anything. I really don’t know how one can expect a mass-produced, affordable product to do better. They last a good long while.Changing strings is a pain, and always has been. Locking tuners make it faster and easier, but are no more stable than properly loaded strings.
With Safe-T (slotted) tuners -- wound strings: cut the string 2 tuners long. Set the tuner so the slot is parallel with the neck. Insert the string the center hole. Push it down into the slot away from the nut and bend it sharply halfway around the post towards the nut. Keeping tension and downward pressure, wind until it is somewhat taut.
G string -- same as wound strings except cut the string 3 tuners long. This will wind the string far enough down the post to put adequate pressure on the nut. Make sure your bends are sharp.
B & E -- cut the string 3 tuners long. Don't forget to line the slot with the neck. Insert the string, bend it as before. Wind halfway around the post, then run the string through the slot again. Pull it tight, then wind around the post, maintaining tension ad downward pressure. This forces an overlap that locks the string securely.
Now, the most important part, the stretch. Tune to pitch, put your finger over the string at the nut to keep it in the slot, then use your other hand and 3 or 4 fingers to gently tug on the string. Retune and repeat until the string does not go flat, not even a little.