Not knowing anything about the whole set-up, I am wondering why there is a need for a pre-load on the bearings... if it were a diff, then I can see the reason for preload affecting aspects of it`s operation in terms of switching drive from wheel to wheel, but if this is a drive to one wheel ...?
Found this which may be of interest, I note the mention of staking the thread to the nut, which seems a tad rudimentary compared to the use of a tab washer or castellated nut etc...?
http://forum.jdrace.com/viewtopic.php?t=168
