i know the feeling Chuck ! ...at times in total confusion, i've been hesitant to even touch the needle valve setting in fear of losing the "magical" sweet point !! ...with so much crossover posts between the original blue & later M90 & up models, i also assumed all versions used a Hall sensor..i would be totally lost without Gil & this forum !...Gil, i'm playing around with a battery saver mod like you mentioned but i'm not totally happy so far but we're getting there ! ..i'm cursed with trying to improve things without breaking it..tom.