Abstract: A swing arm has a fixture at one end for mounting a hand tool, and a longitudinally-extending channel including a slot. An elongate slider member is engaged in the channel, and includes a point offset longitudinally from center of the slider member for engagement with a workpiece to define a center about which the swing arm is rotated. A fastener having a head and threaded shank is retained in a recess such that the shank extends through the slot. A threaded knob is engaged with the shank for clamping the slider member in position, and a handle connected to and captively retained with the knob is free to rotate about a handle axis.

Abstract: A blade holder has cutting edges for cutting a frustoconical tip to sharpen a crayon and also for cutting a sleeve wrapping the crayon. Outlet apertures in the blade holder allow the swarf to escape during sharpening. A serrated knife is mounted to the blade holder for circumferentially scoring the sleeve, weakening the cut strip of sleeve or breaking it up to avoid clogging of the outlet apertures. The blade holder includes a coupling by which it may be connected without tools to a mating motor-driven coupling, while ensuring proper axial alignment. A female coupling has an aperture extending between first and second mouth portions in a transverse side and longitudinal end of the first coupling respectively, and joined by a slotted mouth portion. The mating male coupling has a neck terminating in a head at an axial end of the neck. The neck being sized to pass through the slotted mouth portion, and the head being sized to pass transversely through the first mouth portion.