Your turntable may or may not have come with the Ortofon cartridge as an integral part of the headset. If so, you may want to just buy a replacement stylus, because the cartridge is matched to the arm. The suspension and damping block of the cartridge has lost it's viscosity after all these years, and needs replacing. It's probably stiffer than Abe Vigoda's hip.
If you choose to replace the cartridge, you need to acquire one with similar mass and compliance, or you risk lowering the cartridge/tonearm resonance to below 7 Hz or so, and tracking will suffer.
Director of Sales & Marketing, Triad Speakers, Inc.
aka TRIAD DUDE
I can tell people who are judgmental just by looking at them...