How to identify threads

It's a comparatively shit video - because they did NOT go back and correct all their errors - like:

1. The close in's of the markings on the bolt heads - because they got an overly exposed glarey reflection off the surface, instead of the markings, and

2. The failure to zoom in on the one bolt that has 13 threads per inch not meshing with the other bolt that has 12 threads per inch,

3. And a few other things.....

It's the sloppiness and failure to pay attention to NECESSARY DETAIL - that's fucks this up.

They are not making this video for themselves, who do, know, they are making this video for those who don't know.

And because they were so fucking slack... Pfffff - Fuck them off.