We do not know of any repair manuals that are available for the Schwinn Missile electric scooter.
There is an owner's manual that covers all chain drive Currie scooter in general, however, it does not contain very much information on the rear wheel: http://electricscooterparts.com/manuals/ezip750ownersmanual.pdf
There are parts view diagrams attached below for Currie scooter with front or rear brakes. These diagrams do not show very much detail for the rear wheel but they are the only resource that we have available for them.
My friend took the back tire off my schwinn missile and cant get it back together, I told him it was very rough you have to pay attention to all the parts. Is there a manual showing how to do this or a complete manual I can get for this scooter? THanks