Abstract: A device for rotational connection between structural members. A generally cylindrical housing may have a central cavity therein with an open bearing end and an open plug end. A shaft at a first end may be inserted into a bearing and retained therein. The bearing may be disposed in the open bearing end and retained by a first fastener ring. A second end of the shaft may protrude outwardly from the housing through the open bearing end. A plug may be threadably engaged with the open plug end that is threaded. The plug may be positioned at an interior end to be adjacent the first end of the shaft that may have a convex surface.

Abstract: The present invention may be used for illuminating the terrain in the proximity of the axles, differential, wheels and tires for off-road vehicles. An access cover of differential gear axle housing may have lateral ribs formed as part of the cover outside surface. A recess may be formed by recess walls as an element of the lateral ribs. A light emitting device may be mounted in the recess and may be electrically connected through a port in the recess walls to an electrical power source controllable from an off-road vehicle.