help with torsion value tdi 2.0

vw754

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hi, a friends b7 2.0 tdi is juddering,bad first thing,cleaned egr,new glowplugs,maf etc,.....checked torsion value and at that time car was just warm,temp in car was on 70.......torsion value was reading -4.4.............then once car was at normal temp (90) torsion value was reading -3.9 ........ive read this is best set to 0.5 ?

How do i do that? ive fitted cambelts befor,just not on a twincam bkd..........cambelt was replaced on this car 13,000 miles ago,so i just need to adjust torsion value, is it the cam sprocket on my left or right theat needs adjusting,ive read loosen 3 sprocket bolts and use a 18mm socket or spanner on the middle bolt on the sprocket and turn clockwise........anyone help?