I have an 86 190E 2.3 that, after replacing the ft. wheel bearings, i can't seem to keep the spindle nut in one place. After readjusting the endplay, I snug down the lockbolt on the spindle nut and it always works itself loose after a few hundred miles. Question; Is there some really high torque required on the lock bolt? This is really embarrassing for someone with my vast mechanical skills! Please advise!