My point exactly. Make him understand things like out of round cylinders.
Some guys have ideas that people like yourself who have experience know just wont work and the reasons why they wont work.
If this guy is smart he will listen and learn, if not well meaning members like yourself are wasting their time
A long time ago maybe mid 80's my wife tells me her cousins husband flashed himself so bad he was taken to the hospital. Luckily for him his eye site wasnt permanently damaged
I see the guy sometime later at a family get together and ask him how or what happened
Guy tells me he has his welding shield "up" strikes an arc then lowers the shield.......Im like no, you got it backwards, you got to lower your shield first. Now this guy is arguing with me that im wrong, I dont want to make a scene but I tell him, you know im a welder at the plant, dont you think I maybe know what im talking about?
Guy still didnt want to hear it so I just told him keep doing what your doing and you'll be using a seeing eye dog soon and I walked away
Some folks you just cant reach