Every class I teach seems to get something added to it. Based on regs that I get in for service between classes and what students show up with or do during the class.All of these comments ring so true. I’ve taken troubled regs with me to renewal seminars. In some cases many of the other techs had not seen, let alone dealt, with certain issues. Reg service classes can teach you how to service a reg and give tips to some of the simple common issues, but the courses cannot provide a student with “how to” for all unexpected rare issues that crop up. This is something that I learned while taking an electronics course back when I was in the military; the course was thorough, but could not cover every problem, something I learned out in the fleet.
For example, in the beginning, I never told people how an abandoned spider egg case may affect the movement of the lever in the second stage from a reg that had been in storage for a while. I do now.
It's also why my class is 2 days. Minimum of 10 hours.