well, if your aileron trim is all the way to the left what you need to do is adjust the linkage... its pretty easy on this heli first off, remove the front body section, now, look at the linkage in the picture below, that's the aileron linkage, now mentally remember where its at, pop off the linkage, then center the servo trim and turn the top part of the linkage until it looks like its at about the same spot it was at before... then test fly it, repeat as necessary.....