Upgradability of an MMF-5

I'm aware that there are turntables that are more upgrade-friendly but really want to zero in on this table exclusively for this discussion. What upgrades/tweaks, etc, to this table do you think would make an instantly obvious and moderately to highly gratifying sonic improvement in a system limited to the MMF-5 running thru a 1990s Sony ES series HT receiver running thru JBL L-65 speakers (circa 1977). Any and all types of music in a collection of about 500 LPs but with the lion's share being mainstream Rock (not a lot of Metal), Jazz, and Blues...