you can make fine adjustments using the lengthening slots on ball joint method, but you will also need to jam some metal in the hole to pack it out and stop potential slippage. It is trial and error but does work. Try running laser from centre of sub frame forward and see if it hits the centre point at the front of vehicle... I found on my 54 jts it was 5mm out, like the whole car was built 5mm off centre..! so I put spacers on one side to level up. So offside 10mm spacers nearside 15mm spacers....made a difference to handling along with other chassis tweeks. That jts has phenomenal handling now really sticks to the road and doesn't give any sign of breaking grip in them tight bends. ?Quite possible, even when I got this all sorted out there was still a slight difference between both sides by about 1 degree .. they had both pulled in nice but not equal...