A
system and method of
cutting a core out of a finished surface for
keyhole excavation provides a
truck with a
turret to which a support arm supporting the cutter
assembly is mounted, and a stabilizing member remote from the
turret, which allows the
turret to be rotated about its complete arc of motion while stabilizing the support arm at any desired position about the
truck. In a first embodiment the invention comprises an upstanding support rim affixed to or integrated into the
bed of the
truck. In a further embodiment the invention comprises a support member affixed to the horizontal arm and supported by the truck
bed. This makes the
keyhole excavation procedure
safer and more precise, and allows a larger-depth
cutting head to be used in order to penetrate thicker finished surfaces. In the preferred embodiment the cutter head is provided with a
pilot which creates a
pilot hole in the core that facilitates removal, manipulation and replacement of the core, and improves the integrity of the reinstated core.