Patent ID: 7290350

Claim:
An apparatus, comprising: a generally trapezoidal top plate having a length, a first edge parallel to a second edge along the length, a first end, and an angular end face that forms a first 45-degree interior angle with the first edge, a plurality of slots traversing through the top plate, and a securing cut routed the length of the plate and parallel to the edges; a generally trapezoidal base plate having a length, a first edge parallel to a second edge along the length, a first end, and an angular end face that forms a first 45-degree interior angle with the first edge, and a plurality of holes located such that when the top plate and base plate are placed one on top of the other such that the end faces are in alignment the holes and slots are also in alignment; the top plate separatable from and coupled to the bottom plate via a plurality of fasteners such that a fastener passes through each slot and is secured into each hole; a calibration device having a cross-section having the same shape as a cross section of the securing cut, the calibration device mated into the securing cut and held in place via an adjusting screw that tightens into the securing cut; a first fastener being a locking feature passing through the slot nearest to the end face and secured in the hole nearest to the end face; a slide mechanism mated to the top plate via the securing cut, the slide mechanism comprising a securing cut male member that securably fits within the securing cut and is capable of sliding in the securing cut; a face having a slot that runs through the length of the slide mechanism that securably fits about the edge of the top plate, and is capable of sliding over the edge; a top surface that couples the face to the securing cut male member, the top surface having a hole that accepts a locking feature, the locking feature capable of fixing the position of the slide mechanism relative to the top plate.