My front Prop-shaft bearing is making an absolute row, it screeches when ever I back off on the throttle and also when i'm travelling at a constant speed over a bumpy surface. I thought I would have a look at replacing these, I have taken the prop shaft off and the bearings appear to be fixed with cir-clips. Here comes the problem, I have removed the circlips AND the washer immediately behind but the bearing will NOT budge !!!! Are these bearings replaceable, if so how?