I have the Mccullock California chainsaw model number6000160, serial number 13-035375. I would appreciate any help in downloading a manual for this m/c. The locknut that holds the side cover for the clutch housing has sheared the bolt when i was tightening it and i want to see how to dismantle this to change the threaded bolt/shaft that appears to be part of the metal plate that the blade sits on. Thanks Paul