  Aims. Narrow-angle tailed (NAT) sources in clusters of galaxies can show on
the large scale very narrow tails that are unresolved even at arcsecond
resolution. These sources could therefore be classified as one-sided jets. The
aim of this paper is to gain new insight into the structure of these sources,
and establish whether they are genuine one-sided objects, or if they are
two-sided sources. Methods. We observed a sample of apparently one-sided NAT
sources at subarcsecond resolution to obtain detailed information on their
structure in the nuclear regions of radio galaxies. Results. Most radio
galaxies are found to show two-sided jets with sharp bends, and therefore the
sources are similar to the more classical NATs, which are affected by strong
projection effects.
