Twist-Base Mount

A stable, rotatably-adjustable mount for a fixture (such as a conduit holder), comprising:

• a plastically-deformable, dome-shaped base having a convex, fixture-supporting topside portion and a concave, substrate-facing, underside portion opposite the topside portion, having a substrate-engaging portion defined by a circumferential edge;
• a single screw with a non-circular head (for instance, a hexagonal head) that resists twisting, said head rigidly embedded in a conical hub extending perpendicularly away from the center of the underside portion, said screw projecting perpendicularly away from the conical hub and having a pointed substrate-engaging tip and sharp threads to facilitate:
• (a) self-boring penetration of the substrate, (b) compression of the circumferential edge of the base against the substrate, and (c) a corresponding elastic deformation of the dome;
• and
• a fixture (such as, but not limited to, a conduit holder) attached to the fixture-supporting portion of the base.