Myster solved.  : )  Finally found it in archives:

>24mm deepwell socket for oil pressure sender

but this may only apply to wasserboxers.......

Neil.

--- Rich Bennington <rich.bennington@CHARTER.NET>
wrote:

> On Aug 23, 2006, at 2:42 PM, neil wrote:
>
> >
> > I remember reading in archives of 24 mm deep
> sockets
> > when researching tools. Can't find the relevant
> post
> > nor can I recall if I need this tool.
> >
> > On what would this socket be used? Do I need one
> in my
> > arsenal of tools? (I plan on doing most if not all
> my
> > own van work)
> >
> I'm not certain, but I think it's the Oxygen sensor.
>  But on mine, I think
> there may be sufficient room to get it with a
> wrench.
>

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