I have a 1987 E28 and I'm trying to change the impeller on the Universal M12 engine. I've taken the cover plate off and pulled the impeller but the shaft came out with it. There seems to be a retaining clip on the end of the shaft. Nothing I've seen or read talks about this. Does anyone know how to get the 2 pieces apart or know of the tool I use to do so. Thanks Phil S.