How do I remove the platter from a Technics SP-25?

I've got an old Technics SP-25 thats been sitting around forever. I decided to make a project out of it and went to remove the platter for inspection, but it won't come off. It seems to be stuck. I had a similar problem with my SP-15 but it came off with a little machine oil applied and a light tap of the spindle.

I don't know much about the SP-25 and don't want to chance damaging the spindle, platter or bearing so any help I can get will be appreciated, thanks.