Just after some advice, took my 350z to get the tracking done but they couldn’t adjust the rear as the bolts just spin. My mechanic replied with, ‘Sorry no, I believe the sub frame is aluminium which is why the bolts don't adjust very well, I can't weld aluminium with my stuff, the bolts obviously need to rotate in the aluminium part to adjust the geo but the aluminium is very soft so the lugs don't really support the bolt properly’. Just wondering if it’s worth getting new bolts or will I have the same problem?