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What I do in these cases is to use a centre punch to put a dent in the metal where you want the hole. Then on the other side you can see a small raised lump - the opposite of the dent. The dent will be only 1 or 2 mm across and the same deep so if you decide not to drill there is no significant damage. Of course this does only work reliably on metal. ...


2

Using a magnet would not work if the metal is magnetic (any steel or nickel alloy) as the magnetic force is more-or-less lost in the middle. I can understand how a motor vehicle would be challenging to determine a matching location. A method that comes to mind is a length of transparent hose/tubing. An ordinary garden hose with suitable adapters at each end ...


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