Sometimes the tuning pins are very jumpy. You try to turn them smoothly, like with a slow pull technique, and the pin foot jumps and moves much farther than you would like it to.
In that case you can sometimes move farther away with the pitch before the slow pull. This gets the jump to happen early and then hopefully the pin moves smoothly after that.
But some pins are just too tight to ever move smoothly. In that case we need to find the best place for the pin foot and move it there in small increments. Not so easy using slow pull but with move and massage, we can move the pin foot tiny amounts and massage/bent/tilt/flagpole (whatever you want to call it) the pitch down which results in the pin unbending and tightening the NSL tension.
If we apply the right amount of force in the bending phase, then the NSL is tightened enough so that the string remains stable on hard blows.
