Salavat,There is an black plastic cap on the block that connects the(front) armtube with the back-side tube. Underneath this cap there must be some kind of srew that
'allows' the 'centering' of the block on the backside tube.
Sorry for my 'terminology' but this is my assumtion. I had
a similar problem with my 'model VI' but was reluctant to
'correct' this myself. But my Triplanar (then)had an,say,very small 'deviation' from vertical.No idea if this
causes any functional problems but the most of ua,I assume,
regard this arm as a 'work of art' so I can undestand your even,say,'aesthetic worry'. If so you should,I think,return
the arm for 'correction'. I.e. one should be fully satisfied with this tonearm.
Regards,