Factory cassette player help

[Daze57]

should be fairly simple --- look for 2 wheels (usually white ) 1 big and 1 small belt just goes around the big wheel and around the smaller wheel --that should do it
also since you have it apart you should clean the tape ( what the tape rolls across ) and the pinch roller (rubber wheel ) both should be cleaned with a q-tip dipped in standard alcohol (not the drinking type )