DF Cardwell, one of the problems in this country is the dearth of skilled people to maintain equipment. Basically it's a numbers thing and the numbers of darkroom equipment mechanics/technicians available, was terrible 15 years ago when commercial darkroom work, was more or less at it's peak.
I do wish we had, had someone like yourself that we could have called upon to maintain some of the equipment to the level envisaged by the manufacturers, when they originally designed and manufacturered it.
It was not uncommon for an enlarger to be out of commission for up to 6 months awaiting a technician, terrible really!
Perhaps, if we had been able to get our enlargers focusing systems properly calibrated, it would have been a different story. However the units that we used, whilst very good at keeping focus constant and virtually perfect, there was almost always a very, very slight manual change required, for super critical grain focusing.
I have no problem with that as within the parameters of normal enlarging they do hold their focusing ability. But I think that when someone is making an exhibition type of print, they will check and re-check all things, before finally hitting the enlarger timer.
Grain focus is one thing almost every person working in a darkroom at a high standard, considers a reasonably essential ingredient to making a good print.
Mick.