I've got a problem with my Emerson CTR-949. I'm really new as I've just gotten this unit from my dad so I know little to nothing about cassette players. Both of my decks don't work as intended but I'm focusing on deck A. This deck will play the music but it plays really slow. I know you need to adjust the motor but I've taken the radio apart and the motor has the whole to adjust it but there's nothing to adjust. Just looks like a black hole. Is there something I'm missing? Thanks.