Patent ID: 7273332

Claim:
A method of creating a through-hole in a building structure, the method comprising: selecting a first location on a first side of the building structure that will define a first opening of the through-hole; disposing a magnet at said first location; second side selecting a second location on a second side opposite said first side via a magnetic pointer magnetically pointing to said magnet, wherein said magnetic pointer is normal to said second side; and drilling the through-hole from said second side through the building structure in a direction indicated by said magnetic pointer creating the through-hole defined by said first and second openings on said first and second sides, respectively; wherein said magnetic pointer includes: a housing retaining a fluid therein; and a magnetized elongated member defined by a north pole end and a south pole end, said south pole end being pivotally hinged within said housing allowing multiaxial movement of said elongated member; wherein said fluid is a liquid.