i took an schwinn speedster, not sure what year but a good guess its a '76, took most of it apart to clean it all up and replace old nuts and bolts. i took off the chain to let it soak in vinegar and now i have no idea how to put it back on. im sure its a simple problem, but ive never done something like that, at least not since i was a young kid i would imagine. can anyone help me, some helpful tips. basically, how do i put a chain on a 3 speed schwinn speedster from the mid '70's?