something to also consider: is the tone arm level to your plinth. good idea to make sure both are true to each other so when you level the whole table everything is true to each other. Not such an issue with tables that have an arm mounted by the manufacturer, but if you've added another arm defiantly check that it is leveled to your plinth.
I ran into this issue when assembling my Garrard, the Jelco arm (750L) as good as they are have terrible VTA Adjustment that can and does change the arm level to plinth when tightening the VTA Set screw.
I ran into this issue when assembling my Garrard, the Jelco arm (750L) as good as they are have terrible VTA Adjustment that can and does change the arm level to plinth when tightening the VTA Set screw.