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Oh! Man your so funny!
Of course you start with the nut on the end of the wrench! You just lift up the hair and give it a good whack where it was!
Just having a cheap shot, sorry!
A brake line has a flare on its end. Several designs are used.
That is where they get the name flare nut wrench.
A tubing line wrench is the "flared line" & its "nut" with the applied "wrench".
Now to get to the place to hit it. Well that's called the "sweet spot"!
That term I should leave up to your imagination. Or if you play baseball? It's the place on the bat that is "trademarked" in relation with the grain of the wood. I think I was told that the mark faces you when in the upright positon.
In the case of the wrench. It has a forged grain in the metal to make it stronger in the direction around the direction to be used.
You take out any play of the fit. Then preload with "some" pressure. Then its the bump you give it.
The trick is obtaining enough force to quickly to jump the torque up before any flexing of the wrench and compression of the hex flats can happen.
A "nack of the wack" is a mechanic's skill learned from experience or luck. Take your pick!
If it works you found the "sweet spot". It's as good as a home run feels for us that getting paid or not to be "grease monkeys"!
At my age, if you don't have the hair you fake it with the grease. I try to walk around and under more than hang over low fenders anymore? Lifts are made for us old guys.
When I see a man over his engine and the hoods up. It looks like a car eats man situation!
Phil
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Craftsman 11 mm line wrench and a sharp whack [200][1991]