i noticed yesterday one of my rear wheel bearings felt a bit loose so today I was going to tighten it up. I found there was no locking tab and in fact all that was there was the nut and a spacer - if I undo the nut I could probably pull the hub straight off! It's been like it for at least 4 years since I bought it. Question is, is this normal for the rear or has someone just done it wrong?! It's a 2000 TD5 90...