I do get the requirement to have a way of screening out people before the course. As we are divers, you can only really try to relate people's general competence with their level of scuba training, and Chris has decided on Tech certs as being a natural filter to keep out the complete idiots. I remember when I was doing my Mechanical Engineering degree, we were requried to do some 101 courses in an actual workshop, learning to actually make things with our hands. I'd spent my youth tearing down and rebuilding cars, and felt confident in the workshop, but I still learnt a lot. Most of the people doing the degree had suprisingly never lifted a wrench before, and it was actually quite comical and scary watching these same people attempting to use lathes and milling machines to create a functioning product.The same with servicing your regs - i'm sure there's plenty of people with the technical nouse and only an OW cert, but we all know the level of capability required to get an OW cert is not exactly that high in a lot of places. At least people with tech certs should have proven some kind of ability to read a book, follow instructions, and apply logic. Can you imagine the results if some once a year vacation diver serviced his own regs after doing a course 2 years earlier and died?Now personally, i would love to do the course as there aren't even any HOG dealers in Australia yet, but until I pass my Fundies course, i'll just have to suck it up and rely on my shop (which charges over $200 for a service!) or friends network. Having done the SSI Nitrox Course and spent a lot of time studying books like "Deco for Divers" combined with what I believe is a generally pretty good mechanical ability, i think i'd pass the course easily, but I can understand why Chris feels the need to set a higher bar for entry.