Hey there, I´ve had this midnight special for a few seasons now and today as I was riding to school I felt the read wheel slip a bit. Turns out that there is gear oil all over it. I look and see that smooth nut on top of the gear head where the shaft drive comes into it is weeping oil out. I´m at a loss? Why would this just start to happen? I´m not in the know about shaft bikes this is my first so the answer may be right infront of me. Any advise would be most helpful on this one. many thanks, mal