i have had my tsunami for about 2 months now and i have never touched the low speed needle, i was told that it needs to be flush and it will be fine, is this true ? i can't even find a screw driver that will fit it to make it turn , if there is no need to mess with it ,should i be able to tune it with just the high speed needle and idol screw only? and should i adjust idol screw first before the high speed needle?