Abstract: A removable grommet for attaching a string to an object, the grommet includes a barrel defining a central channel extending through a first section and a second section of the barrel, the first section being sized to allow the string, but not a knotted portion of the string, to pass through, and the second section being sized to allow the knotted portion of the string to pass through.

Abstract: 1. A device for placing one or more reference lines on the face of a user in such manner as not to mark the face in any manner. The device utilizes a frame adapted to rest on top of the nasal bone and the ears of the user. At least one line drawing attachment is detachably secured to the frame. The attachment includes an elongated hollow cylinder having an elongated slot extending from the interior to the exterior of the cylinder. The cylinder contains an elongated light source which when electrically energized projects a reference line of light through said slot.

Abstract: An internal combustion engine includes slidable valves. Horizontal valve seats of tapered design are associated with inlet and exhaust ports at the top of the engine's combustion chambers. The slidable valves are generally planar and tapered to conform to the valve seats. A rod is engaged to the rear of each valve and is spring-loaded. Movement of the slidable valves is effected through mechanical coupling of the rotation of the crankshaft to a rocker arm that is oriented substantially orthogonal to the rod whereby crankshaft rotation is translated into horizontal, sliding movements of the planar valves.