Plastic washer missing

Is this a 5 minute argument or can we go the full half hour? It could be any number of reasons why a split pin is hard to remove, I have seen several trackrod ends where the threads in the nut were completely trucked and the only thing keeping the nut on was the split pin. Rust is the most likely cause but a nut slightly undoing is also possible, in fact with DIY mechanics anything is possible.

And in the real world I know of several people who have driven a car until the front wheel has fallen off because the wheel nut have come undone..

The OP got me confused with the "top of the nut" bit, I wish I had not bothered to reply now.

Have a look at the article "Horror story" by following this link:

That is this months VOSA news letter , the photo was sent to VOSA by a friend of mine who works at a nearby testing station.

On 2006-11-05, Fred >> pin and if the nut became loose then the split pin stopped it leaving the

Then I wonder why the last person to put the split pin in didn't bother to tighten the nut first.

Getting an MOT and it suddenly failing are two completely different things.

And? Did you actually read what had happened? The thread failed. It didn't come undone.

Must be the circle of friends you have.

Or maybe it's because I have been in the motor trade for over 30yrs.

No, not friends. They're called "customers".