First of all it can be done at home. First rule of anything to do with pumps is it's got to be clean. There are two o-rings on each of those (throttle and stop) shafts, you'll also need a gasket to replace the one under the pump cover. If I remember correctly there is a spring that has to be disconnect as you lift the cover off, hopefully someone else can chime in with a picture. Good luck, Sam
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