Then they are a crap gun techwhat if they are a tech, you send them it, it gets fixed but they created a separate problem.
Spot on.Then they are a crap gun tech
The point I am making is the proof is in the pudding. If the person fixes your marker as well as others consistantly, without damaging / breaking it then I would consider them a reasonable tech for that marker.
At the end of the day most 'level 1' tech courses only cover the basics. Hands on experience allows you gain and retain more info than any tech course.