I took the flywheel cover off to figure out the noise my bike was making and found that I can grab the flywheel and pull back and fourth (axial play) on the crank quite a bit which is causing the noise. It looks like the crank moves within the inner race of the bearing. Is this typical? I figured the balls had just worn and created play in the bearing, I didn't expect the crank to slide back and forth in the bearing. I was hoping to replace the bearings and be good...am I looking at a whole new crank? Thanks.