Hugo, the plastic bit on your Counterweight comes off very easily and is just something to vibrate, just pull it with your fingers.
PS it will go back on just as easily.
Paul
Thorens TD 124, Thorens 12" Arm refurbished by Alfred, Shure M55, Denon 103r ,whest PS30R , Auditorium A23 Sony XA20 ES, Benchmark DAC 1 HDR, Elite Townsens 600c Pre,
DPA Enlightenment DAC, , , Radford STA 25 Series 3, Aurex ST S80 , Tannoy Monitor Golds 15" Tannoy York Enclosures, TEAC DS H01, Isotek Substation, Abbey Road Reference Speaker Cables
and some other stuff