The rounded head is the trick: grab a nail or staple low and roll the tool sideways, and it walks the fastener out without enlarging the hole or crushing the surface. And when a finish nail won't come, nip it off and drive it in.
A basic stud finder only beeps once it hits an edge, which tempts you to drive a screw right at that beep — off-center and barely biting the stud. A deep-scanning stud finder lights up the stud's full width as you pass over it, so you can see the actual center and land the screw in the middle every time.
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