Adjustment of the hub gear, in theory, involves putting the trigger in N (2nd) gear and fiddling with the adjuster barrel until the end of the indicator rod is flush with the end of the axle. This only works if your axle and indicator match one another. And even then, sometimes, that doesn't give you the optimal adjustment. I've never encountered an axle/indicator combination that didn't work at all; certain combinations are just a little trickier to adjust.