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Worn steering column? - SimonJ
Has anyone ever come accross a vehicle that require a new steering column do to excessive wear in the column?

If so which vehicle was it, and at what mileage?
Worn steering column? - Cliff Pope
No.
Back in the 50s cars often had felt bushes at the top, and drivers who swung on the wheel to get in and out squashed the bush. But they were easy to replace, and didn't need a new column.
Cars usually have roller bearings now, with a spring keeping them compressed. Sometimes the clamp needs loosening and repositioning, and then the spring takes up any play.
Universal joints connecting the column to the rack can wear after a high mileage if not oiled occasionally, or the clamps can come a bit loose.
Worn steering column? - Aprilia
Common on Renault vans, I believe (And expensive!). Also a problem on Merc. A-Class RHD (basically a design problem).

Worn steering column? - wal750
Had to replace mine on a '93 corsa with around 90k at the time.

Bit tricky to do as one of the bolts that hold it on at the bottom doesn't have a normal head to use a socket/allen key so the only way to get it out is to use a punch or chisel to turn the head. You then just use a new, standard metric bolt on refit.

Got the new collum from a breakers for about a tenner. It was a plastic bush that had worn out on the old one, not replaceable though.