Change all those II WW screws from the first industrialisation time.
Buy if you can NAIM ARO tonearm or their own and balance the
3 springs together with the arm. Thorens prescribed a certain
distnce between the platter and ''base'' which was much more
user friendly. The platter is the only part which is excelent made
and balanced. Check the oil because the bearing (usualy) leak.
Don't buy any ''upgrade'' ; Linn made the most profit from those.
I would recommend Linn to any student. The best value for
a second hand TT. Messing with adjustment is the part of
our hobby. I leaned this from my English theacher.