Join Date: Nov 2011
Location: SF East Bay Area
Your fine tuner (aka needle valve) could be "floating" / "drifting", which is not an uncommon problem. Try it for a day or so and, if the bubble count jeeps on changing, return the whole thing for exchange under warranty.
Courtesy * Integrity * Perseverance * Indominable Spirit * and Self Control
Tenets of TKD