Just for reference,I addressed notchy shifting and false neutrals,with replacing single plate clutch to twin plate,changing spring and opening pre-selector assembly numerous times (spring had already been updated with newer spring) and multitude of control adjustments ...nothing made a difference,for yucks,took a whole pre-selector assembly off a complete transmission I bought cheap,just in case,and she shifted like new.maybe reassembling old pre-selector unit and greasing and checking for anything amiss may make it good again,but it hadn't been touched and went from proper shifting to bad shifting in a short period,may be worth keeping it as a possibility something may be slightly out of spec in there...