Nial,
If the traditional method shown in the H&H video, of wiring and shimming, with straight-edge visual alignment, is the way it's done most places, there's a good bit of human skill left to chance. Granted, a craftsman worth his salt should not have a problem, but that's the reason for a quality control check.
P.S.
passengers will just have to start carrying Gatorade bottles like the truckers on the interstate. Leave them in the seatback pockets for the airline. Our gov'ts seem to be talking out both sides of their collective mouths..."...we won't let them change the way we live...: take off your clothes, no drinks, no nothing to carry on, no peeing, no standing, obey some old bitty that is a waitress in the sky or go to prison, don't say specific words in and around airports or airplanes." Nah, we aren't letting them change the way we live...heck no. Someone will get the message some day.
