I haven't used this turntable for about a year and now that I need it the tonearm will not move up and down easily. I need to know how to adjust to bearings so the arm goes up and down smoothly with no drag. Left/right movement is fine. There is probably a viscous drag mechanism that lets the tonearm drop slowly, but mine stays where it is. The stylus weight was correct when used last so it is not too light. Thanks, Bob