I have this M/G, about 3 years old, works great except for the directional arrow constantly gos off from direction of travel. I ordered and put in couple parts from Jones Trolling Motor but first time I hit heavy moss bed it knocked directional arrow off center again. Not always easy to miss those things and not sure why this keeps happening? I fish Calif. Delta tidal waters with heavy tulles, weeds, hyacinth, moss beds, etc. Anyway anyone knows of to prevent directional arrow from constantly getting out of whack with direction trolling motor head is pointing to? Easy to spin arrow back around to line up but understand all that does over time is make it worse.