Originally Posted by MS Fowler

I agree that its probably not the "best management procedure".
However, having half a thrust bearing will keep the end play under control, but for much less time than if the whole bearing were taking the load.
The crank will only rub on the half that is the larger. Remember, the thrust face on the CS is smooth, so its not like it hits something every half rev.

It might work for a weekend or two, but I'd be replacing it sooner rather than later.