Has anyone ever changed the main pivot bolt on there bike, I’m talking about the one behind the chain ring, I’m gonna try and renew all the frame bearings on my bike soon, I’m not sure what I’m going to find when I strip my bike down and come to that part if it’s a full bolt that goes through the frame or just short bolts that screw in from each side, anyway I’m waffling again, any help would be appreciated please