Sometimes the uncentered steering wheel can be caused by the tech not following through. A "set-the-toe and let-it-go" mindset can be a tech-imposed return to the shop: They didn't know how or didn't care to correct camber and/or caster settings (eccentric cams, slide the cradle).
Masters and ASE A4, alike, are guilty. Then, there are the true alignment professionals who are left scratching their heads, double-checking, triple checking the vehicle, set-up, specs and affected alignment components.
They just can't get a decent FEA the first time.
What's a tech to do? Blame the aligner!
Is it the camera? Corrupted specs? Maybe the boom isn't in perfect sync with the targets?
Well, it could be any one of those things. But 99% of the time, it has nothing to do with the tech or the aligner. It's the rack. And I'm not talking about proving the level.
Let's start with the fundamentals: check out the turntables.
It has everything to do with rack basic maintenance focusing on the front and rear turntables — especially the front units. They are not getting the basic care and feeding they deserve, letting you know their distress by throwing that steering wheel off-center.
Contrary to popular belief, turntable plates are supposed to move with the slightest touch — no true force applied.
Vehicle assaults — such as driving over turntables unsecured (pins out/locks off), not removing plates while other services are performed (allowing service debris to enter units), parking the front tire half-on/half-off the turntables — are contributors to the function decline.
"But it's 'metal.' It's designed to handle the shop punishment."