The slider is located at the pick-up arm and should be easy to access if you are approaching it from the left side og the arm. Tracking force should be set at 1,2 grams if the MMC4 pickup is mounted. If there is an MMC2 or MMC1, the pressure should be between 0,8 and 1 gram.
And yes, both your whole record collection and stylous can be badly damaged if to little or to great tracking force is used
Søren Hammer
Beocenter 9300, Beogam CD50, Beocord 5500, Beomaster 3400, Beomaster 4400, 2 Beogram 4000, Beomaster 8000, 2 beogram 8002, Beovox S-75, Beovox MS150.2, Beovox RL6000, Beovox S-35, Beomaster 6000, 2 Beocord 9000, Beocord 8004, Beocord 5000, Form 1, 2x Beolink 1000, Beo4, MX3500, LS4500. Born 1993.