I've a qualified Diesel Mechanic and my personal opinion on backyard jobs it that there's nothing wrong with it it's mainly the problem where the person doing it either dosn't know what there doing and it just going off the haines manual or dosn't have the right tools. Holden mechanics may have some "Special tools" as the manual may say use Tool number ### which is problary a 13mm spanner. If holden did his hub and brake job they problary end up with the same problem with the klunk but you'd never know about it cause the'd replace it and charged you saying it "Had to be done".