The nails shouldn't be so long that pushing them in an bit will put them in to a pipe. But if so, think about where they may be running, it will be next to a wall and you can always pull up a plank to have a look.
@Sumo started
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The nails shouldn't be so long that pushing them in an bit will put them in to a pipe. But if so, think about where they may be running, it will be next to a wall and you can always pull up a plank to have a look.