A turntable is a very delicate device, and you won’t believe how many people accidentally breaks something trying to fix their turntable. Also, if you are trying to take it apart yourself, it’s best to have the service manual with you because it has exploded views of the parts and can prove to be very useful if you get in trouble. If you don’t have experiences of playing around with turntables and you don’t have the service manual, I strongly recommend that you take it to a professional.