A color filter is formed by directly coating a color filter material on the entire groundwork device surface so as to bury the material in a recessed region, subjecting the material to pattern transfer exposure and thereafter subjecting the resulting material to a developing process. A rail disposed on the casing of the disc drive has an opening. A first plurality of compare signal lines is coupled to the first array CAM cells and a second plurality of compare signal lines coupled to the second array of CAM cells. The distal section having at least a delivery lumen and a guidewire receiving lumen. The internal cavity has a truncated cone for receipt of the mercury ball, a surface of revolution sloping outward from the opening of the truncated cone and an interruption ramp in this surface of revolution to guide the mercury ball into the truncated cone for actuation of a switch when a critical angle of the switch has been exceeded.