New aftermarket (Genuine NLA) lock tab washers (part no. 277311) are of such low quality material, and don't even fit properly. Lock-tabs in this application were discontinued by Land Rover  in Oct. 1980 and were replaced with spring washers (part no. WM600061L), this is on the front stub axle only (the rear uses a nut and bolt set-up). Also apply green loctite to threads of all bolts to prevent oil leaking out of the swivel housing, this also aids the spring washers in preventing the bolts loosening.