I can’t even begin to count how many times I have used non OHSA approved methods to find problems others couldn’t find, or to repair something… Thinking outside the box sometimes is what it takes… lol
Even using a stethoscope, you still have to move it around the same place (moving parts) as a long screw driver or whatever… Not much difference…
Heck I have used a long thick (Mac) prybar before… lol
Yes there is a difference . With the proper listening device at least your are looking at the same area as your probe .
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I understand your point, but you are looking at where you are putting the screw driver or whatever before putting your ear on it… It is like knowing how tight to tighten something without using a torque wrench, it is a feel that you either have or you don’t… And to your original point, true it is not for everyone…
Even with a stethoscope, I will grab a long screw driver 1st to listen to something, or a rubber hose for exhaust leaks, a stethoscope can be overwhelmingly load sometimes and hurt my ears, or simply pick up too much noise… Now one huge advantage a stethoscope has is how thin it is and can be put in very tight places…
And I know plenty other pro mechanics that do the same thing… I also know ones that want all the newest and greatest do das to help them out…