Abstract: A drawing aid device having a base upon which is positioned a rotating cap. The rotating cap is provided with a slot guide which fits into the slot provided in a drawing and measuring device. The drawing and measuring device is provided with a first sliding region and a second sliding region with the slot of the drawing and measuring device being centrally located therebetween. The rotating cap is provided with first and second slide passages for accommodating the first and second sliding regions of the drawing and measuring device. A pivot screw is screwable into a knurled threaded nut and a ridged threaded nut positioned on opposite sides of the rotating cap. A latitudinal aperture in the rotating cap defines a rotational axis which passes through the knurled threaded nut, ridged threaded nut and pivot screw. The rotating cap and drawing and measuring device are rotatable about the rotational axis.