Hi...The front wheel bearings (XT660Z 2008) seem to be flush with the metal-tube that rests between them. So, just how, exactly, do you knock/tap out the bearings with a flat-headed screwdriver, for example, when there appears to be no lip/ridge? Is a special tool needed, if so, what would it be and where could I get it? Thanks...your's...stuck half-way between a job