I get 2 "stories " on replaceing impeller. one was to find screw under carb to release shifter rod??not so no screw. the other was to pull power head. we pulled 5 boldts from underneath houseing pan. 1 boldt is located under throddle control houseing.how do you pull head and/or is there a different method to "unhook" the shifter rod to aallow lower unit to be pulled to get to the pump assy??? manny thanks for any assistance<br /><br />Bud809