the spindle of the driven or non driven axle and to contact a load bearing portion of the bearing assemblies 16 18 a worker in the art will understand that the diameters 70 74 are dependent on the specific application and various configurations would fall within the contemplation of this invention referring to fig3 and 4 the spacer 26 includes a plurality of openings 76 disposed in the second and third sections 66 72 of the spacer 26 pressure applied by the nut 28 creates a leak resistant seal between the spacer 26 and the bearing assemblies 16 18 absent the openings 76 the leak resistant seal 77 would prevent lubricant from entering a cavity 78 formed between the spindle 14 and the spacer 26 this condition would initially prevent lubricant from fully filling the wheel hub 12 because lubricant would not enter the cavity 78 the openings 76 provide for the flow of lubricant into and out of the cavity 78 such that upon initial fill of the wheel hub 12 a true level of lubricant is indicated further the openings 76 are necessary to prevent lubricant from seeping into the cavity 78 and becoming trapped thereby reducing the amount of lubricant available for lubrication of the bearing assemblies 16 18 the openings 76 can be holes 80 slots 82 or notches 84 in this embodiment the slots 82 are disposed in the second section 66 and the holes 80 are disposed in the third section 72 preferably the openings are disposed within the second and third sections 66 72 however the openings 76 may be disposed within any non deforming section of the.