Right millemille I've spent time on it doing everything you stated. I've taken out the rod and cleaned and greased it. I've cleaned the worm and greased it, unscrewed the screw entirely and greased that. I loosened everything and trying lowering the arm. I've then tightened the screw until it stopped then wound it back 1/8th a turn. (In the past this is the step that I did different as in the past I screw it until I saw the arm move then back it off 1/8th.) Is this right now? I will have to go for a ride tomorrow and hope it doesn't slip in the higher gears.
