Abstract: A track apparatus of the type mountable on a rotatable axle of a vehicle is provided with a frame having excellent rigidity. The frame, which is preferably of unique uni-body construction, includes first and second portions that define a drive wheel receipt well therebetween for receiving the drive wheel of the track apparatus.

Abstract: An apparatus for sharpening a chain saw includes a frame, a file guide carriage having at least one guide bore capable of receiving a file therethrough, and a guide bar attached to the frame. The file guide carriage is mounted with respect to the frame so as to allow for sliding movement along an axis and an elongate opening in the carriage is coincident with the axis. The improvement includes at least one easy-to-remove adjustment screw that has spaced-apart inward and outward bearing surfaces threaded into the elongate opening. A bearing member extends from the guide bar and is interposed between the bearing surfaces. This bearing member includes a first aperture aligned with the axis and having a first diameter that allows for the receiving of the adjustment screw, and a second aperture overlapping the first aperture and having a second diameter greater than the first diameter.