@W W Meixner
I like your most recent post but it seems to run counter to what you posted before. Why I don't doubt training and experience are helpful at servicing regulators the problem is that it is difficult if not impossible to get from most manufacturers.
According these same manufacturers, you with your training and experience are no different than me, a yahoo with a wrench. Kind a funny isn't it?
I have far too much of everything too, both old and new. That is why I tell new comers to the world of self-service to standardize on a reg that is simple to service, can find parts for, and doesn't require too many specialized tools.
As far as the Taiwan specials go, they are not much less expensive than what an Apeks regulator sells for in Europe, So why not service them? Think of the environment.
As I mentioned in another post, the traditional dive shop model is dead, the industry has not come up with a replacement model. They instead are trying to milk the old model until it is completely unsustainable. That is why so many dive shops are going under.