Hi, I have a 1975 Peugeot and I want to change out the cottered cranks to cotterless cranks. I am so ignorant about this stuff that I don't even know what I don't know. So, that's why I'm asking you all to help me understand what I need to complete the change. Does the axle have to be changed? Will I have to change out the chain rings? Please help a girl out!