How many specialized tools does one need to overhaul/service a piston/balanced SP 1st stage regulator?
How many specialized tools does one need to overhaul/service a piston SP 2nd stage regulator?
Do you think the training can be done online? As we know, COVID is not over.
Thank you.
The answer might depend on what you would consider specialized. There are very few brand-specific tools that are required, but some will add convenience. An example would be the splined wrench to remove the SP hose fittings. You can successfully remove these fittings with a pair of pliers and some padding, but it's easier with the SP tool. There are various spanners but those don't have to be brand specific. A set of pin spanners and hook spanners that fit will work fine. You don't need the o-ring installation tool but it makes things quicker and easier.
For the earlier SP balanced piston 1st stages, you do need a piston bullet, but that's inexpensive and could probably be made out of dowel with a little work. For the MK15/20/25 you do need some sort of tool to install the bushings; it is possible to do the job without the specific SP tool for this, but again it's much quicker and eaiser with the model-specific tool.
Then there are things like an IP gauge (absolutely needed for 1st stages), o-ring picks (needed for all), torque wrench, allen keys, etc...if you have yoke regulators you need an appropriate socket, and a standard 1" socket won't fit, so you either buy a scuba-specific one or grind down a standard socket. You need a vise to hold 1st stages, you need something to grip them through a port (I just cut a few inches off an old LP hose and use that)
An ultrasonic cleaner is nice to have, but once again, you can make do with just a slightly acidic bath, some time, and a few small brushes. A magnehelic is not necessary, and you can make a sort of manometer with some clear tubing if you want. But you don't need them, you can simply adjust cracking effort to where it 'feels' right, with some experience it's possible to get pretty accurate with your own senses.
I think some people could learn to work on regulators very well with online training, depending of course on the quality of the training and the aptitude of the student. One thing is certain, the in-person weekend 'certification' seminars offered by SP to train their technicians is nothing to write home about. So I'm POSITIVE that Rob's class is far far more comprehensive than that.