> > http://www.brickshelf.com/scans/0000/0398/0398-11.jpg
> >
> > If you look to the left of the step number (14 in this case) you'll see a
> > 2x2 plate with a "thing" on it being attached.
> >
> > What is this piece?
>
> looks like a 2 x 2 plate with wheels holder (#122)
I agree, it was found in old town sets (like '80ies) as far as I know.
Does not look like anything Technic but I guess ppl. might mistake it
for the 2817 plate 2 x 2 with holes.
