bruce bailey· Distinguished SOTW Member/Technician
The whole idea of the microtuner is to put the mouthpiece all the way on the cork and adjust with the tuner. This way the "pocket" that is between the tip of the neck and the chamber of the mouthpiece is reduced improving the overall playing. Shove the mouthpiece all of the way on and adjust the tuner. If it is stuck, there are threads here on how to fix it.