My 1988 4/4 has just passed its MOT but with a warning that the front o/s wheel bearing has a little play. I tried tightening it but it appears that the play is in the bottom of the king pin (rebound spring) - obviously non-adjustable. How much play is permitted there before replacement becomes necessary? At present it is very little but discernible. And how much should king pin, bushes and springs replacement cost? A job for the reasonably skilled mechanic?!