Is the tracking force correct? Is there a setting for anti-skate? My guess is the stylus was a diamond mounted to an aluminum stud which is then press fitted into the stylus cantilever and the diamond is broken off. Take some VERY close up pix of the stylus. I bet its it's flat bottomed because of the damage.
Well i believe cliveb is correct; but after messing with it for a while, I found that putting the "Size" switch to "manual" allowed me to use the turntable normally. Now it functions great!!