Got the impeller done, anodes changed, new depth finder installed (still have to mount it. Drilled 7/16" holes to fill with Marine Tek then drill screw holes into that but weather too cold). On a good note I drilled 7 holes in the lower transom and all wood shavings were light colored and dry. Hope to keep it that way. So anyway, installed the new 'rudder' anode then got the new 15.75x15 prop out of the box and slipped it on. Turned it and 'clink'. Hit the fin on the anode (magnesium). I see they sell other puck style anodes but think I will just trim this one?