Changing the stylus pressure on a technics sl-7 turntable

I own an old Technics SL-7 and was (until recently) not smart enough to change the stylus pressure — even after reading the manual (you can download the sl-7 manual from here btw...)
The magic screw is located on the right side (the location in the manual is therefore completly wrong ;-) )

and the pressure can be changed by ±0.25g: